I would experiment with the dehydrated stuff in advance to make sure it rehydrates quickly, some is better than others and half-hydrated stuff isn't very appetising. Sometimes it's worth adding liquid and letting it soak for a while then you don't waste fuel simmering it. I would certainly be working out exactly how much fuel was needed for each boil and measuring the liquid very carefully so as not to waste fuel.
Yep, gonna be months and months of planning, testing and trying recipes and kit.
Will also be using pot cosy's to increase efficiency.
Julia