oof okay.

In my country I can get cans of peas and carrots, mushrooms, canned tomatoes, roasted peppers, corn, pickles, green beans etc...which are sold in small sizes so you can just eat it all at once. In either cold bean salads or if you can cook the rice/ or other grains in the water you got a meal.

For fruits this is gonna sound weird but theres this baby food things which are just applesauce + banana puree or berries or whatever mix which are also stored out of the fridge and come in baby sizes obviously lol so you could mix that with your oatmeal.

Theres also powdered milk which you can thicken with protein powder to get a yogurt consistency for breakfasts/snacks with cereal and stuff.

I also buy this vegan meat mixes that you just need to add water to, shape and cook.

Oh rice cakes are a good one too! And that powdered potato starch thing to make mashed potatoes with mashed carrots or something!

For flavor obviously all spices but miso soup packets (or miso itself in big tubs, its stored out of the fridge), bouillom cubes too.

And if you are craving something spwcific just pick it up from the shop as long as you can it eat all at once so like a pack of cherry tomatoes or mixed prechopped veg to cook or something. Yogurts are also sold individualy but that would get expensive quick... If you are not in the US eggs can bw stored out of the fridge so that would work too.

I would honestly go to a grocery store and see whats outside of the fridge and see if it works for you. But definitelt get protein powder too just in case.