How Much Water to Store Per Person (FEMA Floor vs Comfort)

People treat FEMA's 1 gallon per person per day like a comfort target. It is the floor. Drinking plus a little cooking and hygiene. Heat, labor, nursing, and pets sit on top of that.

I'm Mike. Union lineman in New Jersey, 22+ years in. I care about the number you can actually lift, not a Pinterest pantry.

Some links are affiliate. You pay the same. Commission keeps the tools free. Researched, not a field-test of every jug.

The two numbers

• FEMA floor: 1 gallon per person per day. Drinking plus minimum cook and hygiene.

• Comfort: about 2 gallons per person per day. Heat, hard work, extra washing.

Do not average them into 1.5 and call it science. Run the household, climate, and activity. Write down what comes out.

Weight: 8.33 lb per gallon. If the total scares you, that is why you store it at home instead of packing it.

Family of 4, 7 days (no pets, temperate, sitting at home)

• Floor: 4 × 1 × 7 = 28 gallons (about 233 lb)

• Comfort: 4 × 2 × 7 = 56 gallons (about 467 lb)

Kids under 5 count at 0.5× in the calculator, not every child. Nursing adds. Dog 0.5 gal/day. Cat 0.25.

Hot and arid climates need more (about 1.5× to 2× on the floor). Heavy labor does too.

Run yours: Water Storage Calculator.

Two time horizons: 3 days and 14 days

The gallon-per-day number only matters once you pick how many days you are covering. I plan two.

• 3 days (72 hours). The short floor. Enough to get through a storm, a boil notice, or a water main break while you figure out what comes next.

• 14 days. The home goal I size toward. Agencies say to keep "several days" of water. Fourteen is my planning number for a house, not an official rule.

Same family of 4 at the FEMA floor:

• 3 days: 4 × 1 × 3 = 12 gallons (about 100 lb)

• 14 days: 4 × 1 × 14 = 56 gallons (about 466 lb)

That 14-day number is the same 56 gallons as a week at comfort. Either way, it is a closet shelf or a corner of the basement, not a backpack.

Weight is the part people skip. Four hundred sixty-six pounds is more than most floors, shelves, and backs want in one spot. Splitting it between a few places in the house makes it easier to store, easier to rotate, and easier to reach when you actually need a gallon.

Write your number down

Do the math once, then put it somewhere you will see it. A sticky note on the shelf works. Write three things:

1. People (and how many are under 5)

2. Days you are covering

3. Total gallons and total pounds

When the household changes, a new baby, a dog, a parent moving in, run it again. The number is only useful if it matches the people actually living in the house.

What to buy after you have the gallon number

Clean empty bottles first if money is tight. Then sealed storage if you do not want to hunt jugs this week.

Once you know the gallons, buy containers that fit where you live. A third-floor apartment is not a 55-gallon drum job. Filters and refillable jugs matter when sealed storage is not enough yet. Keep shopping on Prepper Evolution tools and product pages so you size first, then buy.

Do not buy a 55-gallon drum for a third-floor apartment. Living situation in the tool drops tanks that will not fit.

What this is not

• Not a bug-out pack. Twenty-eight gallons does not walk with you.

• Not "2 gallons because FEMA is wrong." FEMA is the floor. Comfort is extra.

• Not a field-test of every jug on a shop shelf.

Next

1. Water Storage Calculator

2. 72-hour kit builder if you still need a grab bag, not a closet

3. Food storage calculator after water is honest

Mike Sasarak is a New Jersey union lineman with 22+ years on the job. He writes at Prepper Evolution about calm, practical readiness for families.

Originally published on Prepper Evolution.