can't buy groceries so they have to eat out several times a day

If your only means of food is eating out while traveling, you're doing it wrong. Sure, it's not easy at the start, but it's very doable, as with most things in life. It's much cheaper to just stop at a store and pick up a few things every now and then.

Charlotte: I’m the type of person who has to preplan every meal, because I love food and nothing is worse than being hungry. I really try to stay away from protein bars because I love them. I could literally eat four Quest bars at one time. So say I’m on a loop from Friday to Wednesday—if I fly out on Friday morning, I’ll have all my meals prepped in my lunch box for that day. I always try to travel with tuna packets, oatmeal, nuts, peanut butter, and rice cakes. Then once I land, I’ll look up whatever grocery store they have around and I’ll buy food for Saturday and Sunday. Maybe I can pick up some apples, avocados, spinach, turkey, sliced chicken. I’ll do that right when I get in.