Emergency home drinking-water storage: stackable water containers (WaterBrick-style 3.5 gal, 5-7 gal jugs, 55-gal barrels), siphon and bung pumps, spigot caps, water preserver concentrate, and storage-sizing by household and days

water barrel siphon pump · October 27, 2026

Size the supply first: gallons by household and days

Start with volume, because it decides which container class makes sense. The figure most emergency-planning guidance uses is one gallon per person per day, covering drinking plus minimal food preparation and hygiene. Hot climates, pregnancy, illness, and pets all push the number up, so treat one gallon as a floor, not a target.

Household	3 days	7 days	14 days
1 person	3 gal	7 gal	14 gal
2 people	6 gal	14 gal	28 gal
3 people	9 gal	21 gal	42 gal
4 people	12 gal	28 gal	56 gal
5 people	15 gal	35 gal	70 gal
6 people	18 gal	42 gal	84 gal

Add a gallon per day for each dog or cat, then round up to a whole container. Two weeks for a family of four lands almost exactly on one 55-gallon drum, which is why drum kits are so common. A three-day supply for two people is just two 3.5-gallon bricks. Between those extremes, the real question is not total volume but how many separate containers you can lift, stack, and keep from failing all at once.

Stackable 3.5-gallon containers (WaterBrick-style)

Stackable containers are rectangular, interlocking blocks molded from food-grade HDPE (resin code #2). They stack in a closet, under a bed, or in a vehicle without wasting the dead space that round jugs leave. A full 3.5-gallon block holds roughly 29 pounds of water, since water weighs about 8.3 pounds per gallon, so most adults can carry one by the handle. Many designs have a wide-mouth opening, which matters: you can reach in with a brush to clean, and you can fill from a garden hose without a funnel.

Check three things before buying. First, the cap: some use a standard screw cap with a gasket, others use a larger proprietary cap that fits a matching spigot cap, so confirm the thread before you buy accessories. Second, the material markings: look for food-grade and BPA-free language and an opaque body, since light encourages algae growth in stored water. Third, whether the pack gives you stackable interlock on both top and bottom. Buying in 4-, 6-, or 10-packs lowers the per-container cost, but a single container failing is a much smaller loss than a single barrel failing, which is the main argument for sticking with small units.

5 to 7 gallon jugs and 55-gallon barrels

A 5- to 7-gallon jug sits between a brick and a barrel. At 5 gallons you are carrying about 42 pounds, and a 7-gallon jug is roughly 58 pounds, so these are fine for a car trunk or a garage shelf but awkward for people with back or grip limits. Most carry a handle and a screw cap, and many accept a spigot cap or a hand pump. Look for a wide mouth, a thick wall that does not bulge when full, and a cap you can tighten by hand without tools.

A 55-gallon drum is the bulk answer: lowest cost per gallon, fewest fills, and the most weight. A full drum is around 460 pounds, so it must be filled where it will stay, on a pallet or a level, load-bearing floor, never on a raised or finished surface you cannot afford to damage. It cannot be moved full, and you cannot drain it by tipping. Every drum has two bung openings, so you need a bung wrench to open them and a pump to get water out. Drums are also a single point of failure: a cracked seam or a bad bung gasket loses the entire supply. Never use a drum that has held anything other than food-grade product, and keep any plastic container away from gasoline, solvents, and fertilizer, because polyethylene can pick up vapors.

Siphon pumps, bung pumps, and spigot caps

A full container is only useful if you can get water out cleanly. Spigot caps replace the standard screw cap and give you a tap on a 3.5- or 5-gallon unit. Lay the container on its side or set it on a counter, and water flows into a cup. A spigot needs an air vent, usually a small vent cap or a loosened fill cap, or flow will glug and slow. Keep a spare gasket, since spigot seals are the most common slow leak in storage.

For drums, the two accessory classes are siphon pumps and bung pumps. A hand siphon pump (a squeeze-bulb or shaker-style unit with a tube) starts the flow and then lets gravity do the work, but it needs the receiving container below the drum, so you need to raise the drum onto a stand or pallet. A bung pump threads into the 2-inch opening and has a dip tube sized for the depth of a 55-gallon barrel, so it works at any height and lets you fill a pitcher or bucket at ground level. Rotary hand-crank styles move more water per stroke than plunger pumps, while a plunger pump has fewer parts to wear. Check that the tube is food-grade, that the pump fits your bung size, and that the hose reaches the bottom of the drum so you can draw it down fully.

Water preserver concentrate and treating what you store

Water preserver is a liquid concentrate you add by measured dose when filling a container. Manufacturers state a shelf life on the label, and the label dose, not a rule of thumb, is the one to follow. A preserver does not purify unsafe water: it is meant for water that is already safe to drink going in. Check the label for how it is intended to be used with municipal tap water versus well or other sources.

If you do not use a preserver, the alternative is storing treated municipal tap water and replacing it on a schedule. City tap water usually carries a disinfectant residual, which helps, but well water does not, and untested well water should be checked with test strips or a lab kit before you store it. For emergency disinfection, follow current CDC instructions on unscented household bleach rather than improvising the dose. If you collect water of doubtful origin, stored water can be run through a countertop gravity filter or a portable filter before drinking. Treatment advice depends on your local conditions, so ask your health department if you are unsure.

Cleaning, filling, placement, and rotation

Before the first fill, wash every new container with dish soap and rinse thoroughly. A common sanitizing step is a dilute unscented bleach rinse, followed by several clean-water rinses; check CDC wording for the strength. Fill from a clean potable source with a food-grade hose, leave a small amount of headspace, and tighten the cap. Headspace matters in cold climates, because water expands when it freezes and can split a fully packed container. If you live where pipes freeze, store containers in a conditioned space or insulate them.

Store in a cool, dark place away from direct sun, fuel, and chemicals, and off a bare floor that sweats. Label each container with the fill date. Many people rotate untreated water about every six months; if you use a preserver, follow its label interval instead. If water smells or tastes off, treat or discard it. A rotation habit is easier if you tie it to a recurring date, such as the daylight-saving change, and use the old water for plants or laundry.

Kit checklist and which setup to buy

For a 3-day supply for one to three people, two to three stackable 3.5-gallon bricks with a spigot cap are enough, with minimal upkeep. For a week for a family of four, mix: a few 5- to 7-gallon jugs for pantry or closet, plus a couple of bricks for grab-and-go. For two weeks or longer, a 55-gallon drum with a bung wrench and pump covers the bulk, backed by a few small containers you can carry if you must leave.

Checklist: containers sized to your table above; spigot caps with spare gaskets; bung wrench and a siphon or bung pump if you own a drum; funnel and food-grade hose for filling; preserver concentrate if you want longer intervals; unscented bleach and a dropper for emergency disinfection per CDC instructions; a filter for questionable sources; test strips if you rely on well water; permanent marker and tape for date labels; and a clean cup or pitcher for dispensing. The most common failure is buying one big container for convenience and then having no way to move or dispense it.

FAQ

How much emergency drinking water should I store per person?

The common planning figure is one gallon per person per day, which covers drinking and minimal hygiene. Increase it for hot weather, illness, pregnancy, and pets. A three-day supply is the minimum, and a two-week supply is a stronger target if you have the space.

Is a WaterBrick-style container better than a 55-gallon barrel?

Stackable 3.5-gallon bricks are portable and fail one at a time, so they suit apartments and grab-and-go. A 55-gallon drum is cheaper per gallon and holds a long supply in one place, but it weighs about 460 pounds full and needs a pump. Many households use both.

Do I need a water preserver, or can I just rotate my water?

A preserver is optional. It is added by label dose to safe water to extend the storage interval the manufacturer states. Without one, you can store treated tap water and replace it on a regular schedule, and well water should be tested before storing.