I just cook the whole meal, perhaps to the texture of almost cooked, then dehydrate the whole works, keeping the chunks small and even smaller with fish and chicken. When rehydrating, I put a cup or two of water into the supper ziplock at the last water stop before the camp spot you're aiming for. Usually, that means emptying out one water jug of the last half litre....not a big addition to your carry.
When you get to camp, you need only warm the mixture in your pot. This does require a stove that simmers some, like a Coleman F1 Exponent. Only problem with this procedure is that you dirty your pot unless you find some means of boiling the stuff in a boil sack.
Listen to the trees in the wind