I remember setting aside $2-$2.25 for lunches when i worked at a grocery store (
when i was really really poor). We also bought beans in bulk and soaked them in water, then cooked them, made for very inexpensive (
although fairly samey) meals.
Something to consider is find out what you can work and cook with. If you only have a microwave where you're going, you're going to be a lot more limited than if you have a stove top. On the other hand you might also get your own mini-stove that runs off gas (
propane or butane or something similar). I've seen and had a cooker that is intended to be used in the microwave.
Also how big is your fridge going to be? It might be a waste of time to make small meals when you can instead make a larger one that takes slightly more time, and then just leave 2-3 days leftovers to eat until you
HAVE to cook again.
A military ration called
hard tack was made which involves wheat flour, water and salt, and is effectively a cracker (
not bad, made some myself), although i wouldn't want to eat
ONLY hard tack, it would definitely help hold you over for one meal if you needed to for a while (
a week or two? It's a bit heavy)
All else fails & you have a microwave (
or can get boiling water) concentrate on meals that only need to '
add water' to work, they will probably contain a good portion of the nutrients and flavoring you need. Actually there's the emergency rations at walmart i've been getting that's potato soup, quite good for making a cup or two of soup at a time, and not that expensive for how many meals it will provide you.
Mmmm maybe i've drifted too much of HOW to do something rather than answering the question...