Water is the one emergency supply you cannot replace with a clever substitute. Freeze-dried and shelf-stable food can wait on a shelf for years, but a family without safe water is in trouble within days, and almost every pantry food also needs water to prepare. This guide covers how much to store, how to pick and sanitize containers, how long stored water lasts, and the three methods the CDC lists for making questionable water safe: boiling, bleach and filtering. We also check real products on Thrivalist, with prices from the live product pages on October 28, 2026 and clear labels for what comes from the manufacturer rather than an independent test.
How much water to store: the 1-gallon rule
The baseline is simple. Ready.gov recommends one gallon of water per person per day, for several days, for drinking and sanitation. The CDC’s emergency water page says to store at least 1 gallon per person per day for 3 days, to try for a 2-week supply if possible, and to count that water for drinking, cooking, brushing teeth and other uses. It also says to store more if you have pregnant women, sick people or pets, or live in a hot climate; Ready.gov adds that children, nursing mothers and sick people may need more, and that in very high temperatures needs can double.
| People | 3-day minimum | 2-week supply |
|---|---|---|
| 1 | 3 gallons | 14 gallons |
| 2 | 6 gallons | 28 gallons |
| 4 | 12 gallons | 56 gallons |
| 6 | 18 gallons | 84 gallons |
These are the arithmetic of the official baseline (people × days × 1 gallon), not a ceiling. If you have pets, a hot climate or anyone with extra needs, add to them. Because the CDC counts cooking in the gallon, remember that rice, beans, oats and rehydrated freeze-dried food all draw from it too; our power outage food plan shows how food and water scale together.
Choosing containers
The CDC’s guidance on containers is specific:
- Best: FDA-approved food-grade containers, available from surplus and camping supply stores.
- If you cannot get one: choose a container with a tight-closing lid, made of durable unbreakable material (not glass), and with a narrow opening if possible.
- Never: use a container that held toxic chemicals, such as bleach or pesticides.
- Safest of all: unopened, commercially bottled water. Keep it sealed in its original container, in a cool, dark place, and observe the expiration date on the label.
How to clean and sanitize a container
Follow the CDC’s six steps before filling any container you will store water in:
- Wash the container with soap and rinse it thoroughly.
- Mix 1 teaspoon of unscented liquid household chlorine bleach (5% to 9% sodium hypochlorite) into 1 quart (4 cups) of water.
- Cover the container tightly and shake so the solution touches every inside surface.
- Wait at least 30 seconds, then pour the solution out.
- Let the container air-dry.
- Fill it with clean water and seal it with a tight lid.
Storing it: labels, temperature and rotation
- Label each container “drinking water” and write the storage date on it.
- Replace water you stored yourself every 6 months (CDC and Ready.gov).
- Store at 50°F to 70°F, away from direct sunlight and from toxic substances such as gasoline or pesticides.
- Keep a bottle of unscented liquid household chlorine bleach on hand for disinfecting water and general cleaning.
- When you use stored water, use a clean scoop each time and do not put hands into the water or container.
Making questionable water safe
If your stored water runs out or the tap is not safe, the CDC lists three approaches. They solve different problems, so know which one you are using.
1. Boiling
Bring clear water to a rolling boil for 1 minute. At elevations above 6,500 feet, boil for 3 minutes. If the water is cloudy, first strain it through a clean cloth, paper towel or coffee filter, or let it settle and pour off the clear water.
2. Bleach
Use unscented household chlorine bleach and check the label for disinfection instructions first. If the label has none, find the sodium hypochlorite percentage; typical U.S. bleach is 5% to 9%. Let treated water stand at least 30 minutes before drinking, and double the amount if the water is cloudy, murky, colored or very cold. The CDC’s amounts for 5% to 9% bleach are:
| Water volume | Bleach (5%–9%) |
|---|---|
| 1 quart or 1 liter | 2 drops |
| 1 gallon | 8 drops |
| 5 gallons | 40 drops |
3. Portable filters
A filter must have an absolute pore size of 0.3 micron or smaller to remove bacteria and 1 micron or smaller to remove parasites such as Giardia and Cryptosporidium. The CDC is explicit that filters do not remove viruses, so after filtering you add a chemical disinfectant (iodine, chlorine or chlorine dioxide) to kill viruses and bacteria. When you shop, read the pore size and the specific claims, and treat marketing language as marketing.
Water gear on Thrivalist, with live prices
Everything below was checked on the live Thrivalist product pages on October 28, 2026. Where we describe performance, we are quoting the manufacturer’s listing, not an independent test, and we say so.
| Product | Price | What the listing says |
|---|---|---|
| Universal Gravity Filter, Nanofiber Fast Flow | $99.99 | Designed to fit most other gravity filter systems; about 10–12 gallons per hour when new; 2.5″ × 7.5″ nanofiber filter with a 5-micron outer wrap and coconut carbon; certified by IAPMO R&T to NSF/ANSI 42 and NSF/ANSI/CAN 372 (the listing does not say which contaminants those cover). |
| Sagan XStream Ultralight Water Purification Straw | $77.99 | Purifies up to 250 gallons; lists 99.9999% of bacteria, 99.99% of protozoa and 99.99% of viruses; 5 oz without the pump and 9 oz with it. The listing does not state a pore size. |
| Survivor Nanofiber Filtered Water Bottle | $49.95 | 27 oz, 304/316 stainless steel; filter rated for up to 400 liters; performance is best with the cleanest water available; lab-test results are not published on the page. |
| H2O ResQ Water Treatment Kit | $44.97 | A 60 mL bottle treats 330 gallons; the manufacturer says it inhibits bacterial growth and keeps stored water clean for up to 5 years; includes a test kit. |
| 5-Gallon Stackable Water Tank | $31.95 single, $127.80 for 4 | BPA-free HDPE described as FDA-compliant for drinking water, stackable, with two caps and a spigot per tank; the listing recommends 3–4 tanks per home. Out of stock on Thrivalist as of October 28, 2026. |
Replacement parts are listed separately: a 5-gallon tank cap is $2.49 and a spigot is $4.19. Browse the full range, including the DuraFlo replacement filter for AquaBrick and Berkey systems at $99.99, on our water & filtration page.
Reading those claims carefully
- Filter versus purifier. By the CDC’s standard, a filter does not remove viruses on its own. The XStream listing says it removes viruses, but it does not give a pore size, so ask the maker for the test standard if viruses are a concern, or add a chemical disinfectant after filtering.
- Capacity ratings are per filter. “250 gallons” or “400 liters” is a lifespan under the manufacturer’s conditions; cloudy water shortens it.
- Treatment drops versus the 6-month rule. H2O ResQ says it can keep stored water clean for up to 5 years. The CDC and Ready.gov guidance for water you store yourself is still to replace it every 6 months. We would follow the official guidance unless the product’s instructions and your local health authority say otherwise.
- Sizing the tanks. At 5 gallons per tank, a family of four needs 3 tanks for the 3-day minimum (12 gallons) and 12 tanks to hold a 2-week supply (56 gallons). Many households combine a few tanks with sealed bottled water.
Build Your Freeze-Dried Pantry
Hand-picked categories for this guide — sealed for 20–30 years, ready when you are.
A simple layered plan
- Layer 1 — the 3-day minimum. Store 1 gallon per person per day for 3 days in sanitized food-grade containers or sealed commercial bottles. Label and date them.
- Layer 2 — extend toward 2 weeks. Add tanks or bottled water until you reach people × 14 gallons, plus extra for pets and hot weather.
- Layer 3 — a way to make more. Keep a method that does not depend on stored water: unscented bleach, a pot and a heat source for boiling, and a filter or purifier you have actually tested at home.
- Rotate. Replace self-stored water every 6 months, and check expiration dates on commercial bottled water.
Pair the water plan with food. Our supply plan comparison shows how food scales from one month to a year, and the food storage calculator gives quantities for your household.
Frequently asked questions
How much water should I store per person?
At least one gallon per person per day. The CDC says to store at least 1 gallon per person per day for 3 days, to try for a 2-week supply if possible, and to store more for pregnant women, sick people, pets and hot climates. Ready.gov notes that needs vary with age, health, activity, diet and climate.
How long can I store emergency water?
The CDC says to replace water you store yourself every 6 months. Unopened, commercially bottled water is the safest and most reliable emergency source, and you should observe its expiration date. Keep containers at 50°F to 70°F, away from direct sunlight and from toxic substances such as gasoline or pesticides.
How do I purify water with bleach?
Use unscented household liquid chlorine bleach with 5% to 9% sodium hypochlorite, and check the label first. The CDC table calls for 8 drops per gallon (2 drops per quart or liter), then letting the water stand at least 30 minutes. If the water is cloudy, murky, colored or very cold, double the amount.
How long do I boil water to make it safe?
Bring clear water to a rolling boil for 1 minute, or 3 minutes at elevations above 6,500 feet. If the water is cloudy, first filter it through a clean cloth, paper towel or coffee filter, or let it settle and draw off the clear water.
Do water filters remove viruses?
Not by themselves, according to the CDC. Portable filters need an absolute pore size of 0.3 micron or smaller to remove bacteria and 1 micron or smaller to remove parasites such as Giardia and Cryptosporidium, but they do not remove viruses. After filtering, the CDC says to add a chemical disinfectant such as iodine, chlorine or chlorine dioxide.
What containers are safe for storing water?
The CDC says FDA-approved food-grade containers are best. If you cannot use one, choose a container with a tight-closing lid, made of durable unbreakable material (not glass), with a narrow opening if possible. Never use a container that held toxic chemicals such as bleach or pesticides.
Sources
- CDC, How to Create an Emergency Water Supply.
- CDC, Making Water Safe in an Emergency.
- Ready.gov, Water and Build a Kit.
- Product details and prices from the live Thrivalist product pages, checked October 28, 2026; listings, prices and stock can change.
Thrive Freeze earns a commission when you buy through our Thrivalist links, at no extra cost to you. See our affiliate disclosure. This article is general preparedness information, not medical advice; follow your local health authority’s instructions during a boil-water or contamination event.