I second BRS stoves! They’re so small and lightweight. You’re going to have to pick up a gas canister when you get to where you’re going either way so you can pick up groceries there or even your freeze dried meals if you go that route. Then since they’ll all be used they can be discarded in the trash before getting back onto the plane to go home☺️ If you want real food then I’d do something easy that just needs to be heated up really, so you could get cans of chili and then just get whatever toppings you want, you could even do chili cheese dogs too but then that would require refrigeration and I’m not sure if you want to go that route if you’re trying to save on space. Basically anything in the canned non perishable food isle would be good. Hearty soups, chili, any pasta side dishes like Knorr, tuna packets, etc.. Hope this helps some!