Source: http://foodstoragemadeeasy.net/babysteps/step-2-water/

Most sources recommend 1 gallon of water per person, PER day, for 3-14 days. Make sure to consider storing enough for pets as well.

• Store water in “FOOD GRADE” or PETE plastic containers (stay away from milk jugs, but soda bottles are suitable).

• Water storage boxes are another good option. Water is placed into mylar bags and then inserted into stackable cardboard boxes.

• Store water away from too much light or heat.

• Store away from chemicals (paint cans, gasoline, fertilizer, weed killer, cleaning supplies).

• Clean, sanitize, and rinse all containers prior to use.

• Do not use containers previously used to store non-food products.

• Store water in multiple sizes of containers to suit different emergency needs

• Do not store water containers directly on concrete (chemicals in concrete can be absorbed into plastic containers). Place on cardboard, wood pallets, or other materials.

• Non-chlorinated water (most municipal water is chlorinated) should be treated with unscented liquid household chlorine bleach (5 to 6% sodium hypochlorite). See the chart below for appropriate amount to add to water.

• Boiling is the safest way to clean water, however you can also use household liquid bleach to kill microorganisms.

• Rotate your water storage at least once every year