Meal prep two containers of veggie stir fry and rice, usually works out to be 3 or 4 meals and since theres no meat it holds up well and I worry less about it staying cold. I Also pack uncrustables (im a child), trail mix, cliff bars, some fruit.

I also pack a handful of oatmeal packets for breakfast, easy to pack and easy to make using the kuerig and coffee cups in the hotel. Even with all this I usually end up having to by a meal or two on a 4 day, but still spend far less and much healthier compared to airport food.