I'm bringing a rubbermaid tote with dry goods and snacks (hamburger helper, dry pasta, pasta sauce, oatmeal, muffin mixes [and muffin tin], pre-cooked bacon, bread, 100 calorie packs, slim jims, crackers, peanut butter, jelly, salt & pepper, condiments, cooking spray, etc). The only things I will have to buy when we get there are ground beef, chicken, lunch meat, eggs, and milk - all easy sections to find at any grocery. I might find the frozen foods and get some waffles too.
I cook nutricious food at home; I'm ok with junkier stuff on vacation, esp if it's easy to pack, like the hamburger helper. It's got to be better than chicken nuggets and fries for every meal.