depends how much food you're rehydrating.

If you don't have directions, weigh it before and after you dehydrate. The difference
is how much water you should add - if you're doing it in metric it's easy - 1 gram == 1ml of water. If you're in that flems per cubic furlongh system used in the states, well, it's
more complicated but still doable <img src="/forums/images/graemlins/wink.gif" alt="" />
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