Perhaps the most important part of your long-term emergency storage will be a supply of clean drinking water, experts recommend 1 gallon per day per person. With water supply boxes you can utilize your storage space and have an emergency water supply that you can take with you. Store long-term potable water in 5-gallon Mylar bags, Aquamira water treatment included. Each 5-gallon bag is thick, durable, hard to pierce and stored in stackable, heavy-duty boxes. Water treated with Aquamira is drinkable for 5 years.