OP, is your aim to have a hot meal at dinner?
Have you experimented with the jarred spaghetti sauces out there? some are pretty good. If you find one you like, cook some pasta like penne or rigatoni at home, mix liberally with sauce and spoon into zipper plastic bags. With some crusty bread and a salad, a good meal you can heat in your pot or skillet. (Be sure to take a shaker of parmesan cheese).
Skillet -- how about grilled cheese sandwiches? You can vary the breads and cheese to experiment - a very filling meal with olives, carrot stix, perhaps a side of soup you heat up in your pot? Of course you can add ham, etc.
Second the person who says to bake, broil or grill a number of chicken breasts before you leave home. Nothing beats cold chicken, crusty bread & butter, white wine and perhaps some cheeses, pickles, olives and veggies & dip for a meal in warm weather. Or, you could heat them and eat with steamed veggies, fried potatoes, whatever suits you.
It took years but I finally found a decent deli roast beef (Dietz & Watson top round) without a lot of seasoning. Get a pound of that and you can heat in your skillet with a jar of whole button mushrooms & Heinz Bistro Au Jus gravy (comes in a jar) - make a lovely French Dip sandwich with a handful of potato chips, a big dill pickle and a salad.
How about pizza? Get those Boboli crusts, a can of pizza sauce (I like contadina), a can or jar of mushrooms, a bell pepper and a package of hormel pepperoni along with a bag of shredded mozzarella from the grocery store. Voila! Pile on the ingredients plus whatever others you like, put the pizza in the skillet (I'd buy the personal size pizza crusts and make multiples; good for lunch or breakfast the next day) and you've got a great meal with a salad, a beer or Coke.
Do you do omelettes?
Again, not sure if you are looking for recipes or just ways to assemble prepared food. Can you bake some large potatoes at home before you leave and heat them in the skillet? A dollop of butter and sour cream, some crumbled bacon you cook at home, some chives -- with a beer or wine, a great lunch or dinner. Add a can of French Onion Soup (or make it from the packet; Knorr is decent) and some of that deli roast beef and you have a meal fit for a king in minutes.
Then there's the fruit meal, the snack plate (cheeses and relishes and hummus), the yogurt -- you can have a really varied diet without much cooking at all.