Water isn’t that…you know, rare. Even a survivor in early game is easily able to find water and clean it with little effort, and mid- to end-game survivor tend to have a large supply of (clean) water and other drinks.
Also, from my experience, a dehydrator usually works in a way where the moisture from the food just gets released through air vents into the surrounding air. There simply isn’t a a place where the moisture gets condensed back to water, why would there? There isn’t a reason for pre-cataclysm dehydrators to have a feature like that.
You would need to build your own, improved Dehydrator, for example where the air vents lead into a hose or pipe of some kind, which is long enough for the air to cool off and the water to condense, and THEN you could put a container of some kind beneath the hose/pipe to catch the water. That’s a lot of work for a bit of water you could easily grab from a nearby river, pond or even from the rain.
Another thing would be a problem with portions. the minimum for liquids is 250ml ; this is 1 portion of liquid.
Meat has around 60% of liquid in it - you need 2 chunks of meat for dehydration, so you’re using around a pound of meat or around .48kg of meat, so this isn’t a problem - that could result in around 1 portion of water.
The issue shows up when you’re trying to dehydrate vegetables or fruits. There you have massive differences in the amount of, well, matter you’re dehydrating, to name 2 extremes:
You have to use 2 pumpkins to dehydrate them - 1 pumpkin is 1.32 lbs/0.60 kg in weight, so you’re talking about 2,6 lbs or 1,2kg of matter, which should give you AT LEAST 2, if not 3 portions of water.
Another example would be grapes, where you need 4 grapes with 0.66 lbs/0.30 kg each ; that’s be also 2,6lbs or 1,2kg. Grapes are around 80% water, so we’re talking around 4 portions of water here.
Do you see the problem yet? In order to have a byproduct of water which fits the ingredients we would need to either overhaul the recipe itself, which is adjusted to the amount of fruit/veggies you get from farming (I think?), or we would have to split the recipe into dozens of little recipes, which will clutter the recipe menu even more.
If a contributor has an idea how you can implement it, I’d have no problems with it, but it seems to be not worth the hassle, at least in my opinion.