I can't remember how often a pack or two of ramen or rice and a bit of ingenuity can result in tasty-contented-oneness.
I'm not talking Niea_7's peapod sushi, just a quick pan fried noodle or fried rice with whatever you have, including canned veggies and SPAM. You can fill two people to the bursting point with what it would cost for a fast food run.