We usually go for "easy" but filling, and usually have a variety to choose from.

Breakfast:

Bagels, peanut butter & honey or jam, instant oatmeal, cold cereal, fresh fruit, milk, juice and/or coffee.

Lunch:

Sandwiches, smoked oysters, kippered snacks, hard salami or jerky, string cheese, bagels, crackers, granola bars, candy bars, fresh fruit, pudding packs, etc.

Dinner:

Hamburger Helper or Tuna Helper, canned stew, grilled steaks/chops/fillets, fried spuds, canned veggies, spaghetti w/marinara, garlic bread, tacos or fajitas, rice, Ramen noodles, etc. A lot of times breakfast items are on the diner menu too; ham steaks/sausage/bacon, eggs, hotcakes, hashbrowns, etc.

The worst hunt I ever went on as far as meals went is when I was first married, a buddy and I took his trailer and decided we'd save time and energy and bought TV dinners for every meal (breakfast, lunch and dinner!) I was so tired of those things by the time we got done it wasn't even funny!