Freeze dried foods are wonderful when weight is critical, and water is abundant, as in backpacking in the Sierra Nevada. When potable water is scarce, other forms of chow are much better, as well as cheaper. An apple is mostly water, as are other fruits, as well as tasty and nutritious as well. It is probably a good idea to have a variety of staple foods available, as situations can change. Canned goods are cheap, durable, and usually have plenty of water.