Breakfast - cereal, biscuits or cinnamon rolls (Pillsbury in a can ones), pancakes (on vacation we put mini chocolate chips in our pancakes... a guilty pleasure!), cheese omelettes, peanut butter and jelly sandwiches, french toast, breakfast sausages, etc.
Lunch - sandwiches, wraps (make your own with whatever filling you like), grilled cheese, hot dogs, mac and cheese, chicken nuggets, popcorn, lots of cut up fresh fruit (my kids can eat an entire apple orchard
), etc.
Dinner - Chicken parmigiana (I'm Italian - need my chicken parm!), rotisserie chicken like a PP suggested with veggies, pasta and meatballs, burgers or steaks, baked pork chops with stove top stuffing on the side, salads, we go through several bags of Steam Fresh veggies, fajitas or tacos, sloppy joes made with ground turkey, etc.
We either do a grocery run on our first day or plan ahead and have Garden Grocer deliver the basics. All our meals are single course, fairly simple ones and while we try to eat healthy, we do get more processed things while on vacation for the convenience. I figure so long as we've got lots of fruit and veggies for snacks and sides, it balances out.