On our last trip, we shipped some items from Walmart.com like bottled water, granola bars, Pringles, oreos, baby formula and almond milk. From home we brought bagels, homemade breakfast breads and muffins, loaf of bread, crackers, jar of pb, packets of mustard, mayo and honey. From the resort store, we bought milk, eggs, lunch meat, cheese and a box of cereal.
We probably wouldn't have taken quite so much except that one of my ds's has a milk allergy and it can be hard to find breads, bagels, muffins, etc that are milk free. Even snacks are hard sometimes. So, we traveled with quite a bit of food for him. But it was great cause we do love to snack. We went home with very little left.