Kaulav/Prepare/United States

How much emergency water should you store in the US? One gallon a day.

Ready.gov (FEMA) says you may need to survive on your own for several days after an emergency. Store one gallon of water per person per day for drinking and sanitation, at least a several-day supply of non-perishable food, a battery or hand-crank radio, a flashlight, a first aid kit and extra batteries.

Ready.gov (FEMA) · July 2026Checked 4 November 2026
The Ready.gov water rule
gallon
1 gallon per person, per day, for several days
Water
gallon a day, per person
Emergency
free from any phone
At a glance

The official numbers for the US

Every figure comes from the official source, linked below.

Cope on your own forSeveral daysReady.gov's Build a Kit page gives no fixed number of days
Water1 gallon per person per dayAbout 3.8 litres, for drinking and sanitation
Hot weatherWater needs can doubleChildren, nursing mothers and sick people need more too
FoodAt least a several-day supplyNon-perishable
Emergency number911
The kit

What the official kit list includes

Ready.gov's basic disaster supplies kit, in its own order.

  1. Water01
  2. Food02
  3. Battery-powered or hand-crank radio, and a NOAA Weather Radio with tone alert03
  4. Flashlight04
  5. First aid kit05
  6. Extra batteries06
  7. Whistle to signal for help07
  8. Dust mask08
  9. Plastic sheeting, scissors and duct tape09
  10. Moist towelettes, garbage bags and plastic ties10
  11. Wrench or pliers11
  12. Manual can opener12
  13. Local maps13
  14. Cell phone with chargers and a backup battery14
Water maths

How much water to store

Ready.gov says one gallon per person per day, for several days. Per day, that works out to:

1 persongallon (3.8 L)
2 peoplegallons (7.6 L)
3 peoplegallons (11.4 L)
4 peoplegallons (15.1 L)
5 peoplegallons (18.9 L)

Kaulav's arithmetic: 1 US gallon is about 3.79 litres. Multiply by the number of days you plan for.

Beyond the kit

Also advised

What the official guidance adds.

Sources

Straight from the source

Kaulav is independent. We summarise official guidance, link to it, and never rewrite safety steps.

How many days of supplies does FEMA recommend?

“After an emergency, you may need to survive on your own for several days.”

Ready.gov says you may need to survive on your own for several days, and recommends at least a several-day supply of food and water. Its current Build a Kit page gives no fixed number of days.

Quoted from the official source. In an emergency, call 911.
Good to know

Questions people ask

How many days of supplies does FEMA recommend?

Ready.gov says you may need to survive on your own for several days, and recommends at least a several-day supply of food and water. Its current Build a Kit page gives no fixed number of days.

How much water per person for an emergency?

One gallon per person per day, for drinking and sanitation. Children, nursing mothers and sick people need more, and in very hot weather water needs can double.

What goes in a basic emergency kit?

Water, food, a battery-powered or hand-crank radio, a flashlight, a first aid kit, extra batteries, a whistle, a dust mask, a manual can opener, local maps and a phone with chargers and a backup battery.

From the official advice to your kitchen table

Kaulav turns this into
your household's plan.

A kit sized to who lives with you, reminders before anything expires, offline maps and a power-cut mode, all built on the US's official advice. Works with no internet. iPhone, early 2027.

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Every government gives a different number

United KingdomdaysCabinet OfficeUnited StatesYou are hereSeveral daysReady.gov · FEMAGermanyideallydaysBBKNetherlandshoursNCTV · Denk vooruitFrancehoursSGDSNSwedenat leastdaysMSB, now MCFEuropean Unionat leasthoursEuropean Commission