When food is dehydrated, the water is slowly cooked out of the food without actually cooking it. You can dry food at home by yourself with a food dehydrator, or choose from of myriad of dried foods available on the market. The most popular forms are packaged for long term storage in #10 cans with an oxygen absorber.
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Dehydrated and freeze dried foods are light, compact and easy to store, but if the majority of your emergency food supplies are dry, you need to remember that you will need to store extra water to rehydrate many of them.