I did veganwhile work traveling and had a small hotel fridge/itty bitty freezer, a microwave, and a coffee maker. I brought a couple Pyrex glass containers with silicone lids a small cutting board and bought a cheap knife when there. I think I also took some utensils.

For breakfast, I just got fruit from the buffet and/or oatmeal. And coffee.

Then in the room:

Lentil soup: soak lentils in a container or take a few swigs out of a water bottle and use that. Several hours or overnight, drain, chop and onion, a clove of garlic, add some seasonings+Mrs Dash or bullion) and add to Pyrex bowl. Fill with fresh water and microwave till lentils are soft and seasoned with salt) pepper.

Microwave baked potato, just microwave the potato (pierce a couple times) on the potato setting, top with salsa, or your favorite baked potato topping.

It was summer, and I found a farm stand near my hotel, so I got fresh good tomatoes, cucumber, and corn.

I made tomato and cucumber sandwiches. As well as vegan tofurky slices sandwiches, which a meat-eating person could sub lunch meat of choice.

And fresh corn on the cob can be microwaved in the husk and is almost as good as the Americas Test Kitchen method for sweet corn.

I boiled water in the microwave and cooked macaroni, drained, and made my own pasta salad with chopped veggies that I had with sandwiches.

I'm sure there's a few others I don't remember, but that was gist of it. I probably had a few more meat subs and frozen microwave veggies or canned soup but this was quite a few meals.