Although the dehydrated foods require water and fuel to use, they are worthwhile for short-term emergencies. Especially, bug-out type scenarios where weight is a major consideration.
Dehydrated food requires water. So, if bugging out, you need a supply of clean water or you don't eat. If you cary your water with you, then you might as well carry regular food.
It seems to me that the only way in which this might be of benefit is if you can readily find clean water, or water that can be made clean, at your destination. Otherwise, toss it.
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