Vegetable stir-fry, curry or similar should be easily do-able. There’s plenty of fresh veg that will keep long enough out of a fridge or canned asian veg is decent. Tomato or pesto pasta. Stew made with canned beef isn’t bad. Omlette.

Do you have a cool bag/box? Grab a bag of ice and you have a fridge for a few days. Even a plastic box would do the trick.