Well well well....I have a few to add-
Ramen noodles cooked as usual but without the seasoning, once cooked drain and toss in some canned chopped tomatoes and heat. Lots of salt and pepper.
Luncheon meat and tomato sauce on toast (YUM!!! Might have to make some tomorrow)
Vegetables (like potato, kumara, swede, parsnip, carrot, silverbeet, onion. DO NOT use things like tomato, lettuce, capsicum, corn) in a pot with water (use only enough to cook them so that you don't have to drain off all the nutrients in the water, but you could keep this water for soups if you wish) and garlic, salt and pepper. Boil until all of the veges are well done. Drain off the water and keep. Now mash all of the veges and add a little bit of the water if needed (think baby food but not as smooth). Finish off with butter if you wish! Mum used to make this as our baby food and my brother (who is 34) and myself (24) still love it to this day.
Now when I started university I was very broke and I lived off plain rice with peas and soy sauce. If I wanted dessert and I had milk I would have rice with milk and sugar. I would have wheat biscuits for breakfast and cups of tea throughout the day to keep the hunger away.
Instant potatoes and powered gravy mixed together and made up is good too!