I always bring a bulk bag of raw almonds to munch on and some fruit or a fiber or granola bar as a snack. For meals, either a frozen dinner or a small portion of leftovers. One place won't let me use their microwave (sensitive to smells of food they might not like to have linger) so I bring cereal and milk, extra healthy snacks, or chicken salad. Nearly always I bring a large coffee to reheat. I hate when the microwave is gunky and has lingering yucky smells. They usually are the same homes with sinks full of yucky stinky dishes. If this is the case, I also avoid microwave food, and the kitchen altogether!