1) I agree the temptation to bring too much food is hard to resist. I always find actual meal planning helps. Plan three good meals a day and some snacks, but don't bring emergency meals. I always seem to bring back extra snacks. I figure bringing an additional "what-if" meal on top of that is overkill. At the end of the day count up how much calories you are bringing.

2) Do you plan on eating nothing but mountain house? I like mountain house... but that seems like a lot of mountain house. They claim the packets are 2.5 servings each, but that is if you add in side dishes. I have a hard time finishing the packet by myself, so I prefer to split them. However, I have a hard time finishing the packet because of the monotony. Half a packet, plus half a side dish or some snacks is pretty good. At 110 lbs, I doubt your wife would be able to finish a MH packet by herself. I also doubt half a packet is enough calories for you.