I'm trapped in a hotel room for the next few weeks with only an ice
chest and no hot plate. But the room does have a mini coffepot and
I learned how to cook ramen noodles in it. Today I picked up some
silken tofu and mashed it up, put it in the coffepot along with the
packet of seasoning, some curry powder (lots of Indian and Asian
stuff in this area), some pure mild chile powder, a bit of soy sauce
a few dashes of hot sauce. Add water and turn coffemaker on and
you've got a very filling and very cheap lunch.

Or use any seasonings of your choice, the key ingredients are the
instant ramen noodles and tofu. Probably costs about $0.25 and
keeps me going until the one main meal my budget allows for at
dinnertime. Tofu is great as long as you mash it up so you don't
notice the icky texture; it has no particular flavor and the
low-fat/no saturated fat protein it contains makes it fairly
filling.