Of everything on the emergency preparedness checklist, water is the one you cannot skip. You can go without food for weeks. You can manage without power. Without clean water, you're in serious trouble within 24–48 hours — sooner in heat, during physical activity, or with very young children or elderly family members.
The good news is that water storage is genuinely simple and inexpensive. It doesn't require special equipment for most households. And it's the kind of thing that takes maybe one afternoon to sort out properly.
How Much Water to Store
FEMA and Ready.gov recommend at least one gallon per person per day as a baseline. For a household of four people, that's 12 gallons minimum for a three-day supply. We'd suggest planning for more:
| Household Size | Minimum (3 days) | Better Target (7 days) |
|---|---|---|
| 1 person | 3 gallons | 10–14 gallons |
| 2 people | 6 gallons | 20–28 gallons |
| 4 people | 12 gallons | 40–56 gallons |
| Family + 1 dog | 14–16 gallons | 45–60 gallons |
The one-gallon figure is a bare minimum for drinking and basic sanitation. Real usage tends to be higher. Heat, physical activity, cooking, hygiene, and pets all increase your water needs. A gallon and a half per person per day is a more comfortable working estimate for most households.
What Containers to Use
Use food-grade containers rated for water storage. Here's a practical breakdown:
- Store-bought bottled water — the easiest starting point. Commercial water in sealed plastic bottles is already food-grade and ready to store. The downside: expensive per gallon, creates a lot of plastic waste, and the containers aren't designed for long-term storage after opening.
- Five-gallon water containers — food-grade plastic jugs in the 5–7 gallon range are inexpensive, stackable, and easy to rotate. Brands like WaterBrick and Scepter make durable options designed specifically for water storage.
- 55-gallon water barrels — if you have the space, a 55-gallon barrel provides a household of four with more than a week of water. Requires a hand pump or siphon to access. Takes significant space and some setup, but is very cost-effective per gallon.
- WaterBOB bathtub bladder — a large plastic bladder that fits in your bathtub and holds up to 100 gallons. Not for long-term storage, but useful to fill just before a storm when you have warning. Inexpensive and compact when not in use.
What to avoid: reused milk jugs (the plastic degrades and can harbor bacteria), any container not rated as food-grade, and containers previously used for non-food items.
How Long Stored Water Lasts
Water itself doesn't expire — but containers and storage conditions affect quality over time.
- Commercial bottled water — sealed bottles are essentially indefinite, but manufacturers recommend 1–2 years for quality. The "best by" date is about plastic leaching, not microbial safety in sealed bottles.
- Tap water in clean containers — properly sealed in food-grade containers, 6–12 months before rotating. Some sources suggest longer, but rotation every 6 months is a reasonable habit.
- Treated tap water — adding a small amount of unscented household bleach (1/8 teaspoon per gallon) can extend storage life. This is acceptable for emergency use. Verify the current recommendation from the CDC or your local water utility, as guidelines can change.
Where to Store It
Store water in a cool, dark location away from direct sunlight and away from chemicals, gasoline, or pesticides (plastic containers can absorb fumes over time). Good locations include a basement, under a bed, in a cool closet, or in a pantry area. Avoid garages if temperatures swing dramatically — though sealed containers can tolerate some temperature variation.
How to Get More Water When Yours Runs Out
For any emergency lasting longer than your stored supply, you need a way to get clean water from other sources. In most common emergencies, these options are available:
- Tap water before a storm — fill every available container (including bathtubs) before a storm or known disruption. This is one of the most effective things you can do with even a few hours of warning.
- Neighbors, community, emergency distribution — during a declared emergency, water distribution is typically organized quickly. Know where your local emergency services center is.
- Natural sources + filtration — streams, ponds, even rainwater can be made safe with proper filtration and/or treatment. This requires equipment (covered in the next section).
- Water heater — most water heaters contain 40–60 gallons of water that can be accessed in an emergency. Drain from the release valve at the bottom. This water may need treatment.
- Toilet tank (not bowl) — the water in the toilet tank (not the bowl) is generally clean tap water. Useful in a pinch.
Water Filters and Purification Options
A water filter is one of the highest-value items in any emergency kit. Here are the main options:
- Squeeze filters (Sawyer Squeeze, LifeStraw) — lightweight, inexpensive, effective. Filter water from almost any fresh source through a squeeze pouch or straw. Great for go-bags. The Sawyer Squeeze filters up to 100,000 gallons. Cost: $20–35.
- Gravity filters (Berkey, Platypus GravityWorks) — larger systems that filter bigger volumes without pumping. Better for home use. Berkey systems are popular but expensive; Platypus is a more affordable option.
- Chemical tablets — iodine or chlorine dioxide tablets purify water chemically. Lightweight, inexpensive, effective. Taste is not great but the water is safe. Good emergency backup. A pack of 50 tablets costs $5–10.
- Boiling — the most reliable purification method. Rolling boil for 1 minute (3 minutes above 6,500 feet elevation) kills pathogens. Requires fuel and time but requires no special equipment.
What to Do During a Boil Water Notice
A boil water notice means your tap water may be unsafe to drink without treatment. Here's what it means in practice:
- Boil tap water before drinking — rolling boil for 1 minute. Let it cool before using.
- Use boiled or bottled water for — drinking, brushing teeth, making ice, preparing food, and washing produce.
- Tap water is typically still safe for — showering, bathing (avoid swallowing), laundry, flushing toilets.
- The notice will be lifted by your utility — follow local announcements. Don't assume it's safe until you hear it's lifted officially.