i feel you bro, i was just there, thank fucking god i just landed another shit job.
I shot for maximum amount of macro nutrients for the buck, i found that the bulk nuts were a pretty good source of both protein and good oils/fats. You can pick that shit up by the pound. My "tastes good food" was microwavable pizzas, and tabasco. tabasco is essential, as it will keep you sane when you've been eating almonds and peanuts for two days straight. god speed.
as a rule of thumb, go to those unpackaged/bulk foods. they're the best deals.