Here's what I bring, not every item, I change them up for each trip but this is for the most part my vacation list for food items. We drive so it's easier to bring a lot of these items. You might want to think about a food delivery service. Garden Grocer is pretty popular on here, and seems to get great reviews.
Breakfast - Pop tarts, Cereal bars, Cereal , Granola bars, fruit, milk, juice or juice boxes, bagels & cream cheese.
Snack - Chips, Pretzels, Crackers, salsa, dips, carrots & celery w/ ranch or another dip.
Late night - Bread or those small rounds 100 calories bun type, peanut butter and jelly. When we would get back to the room, the girls would turn into starving wolves, and this with some milk would take care of it.
Something we started when our DD's were little was to bring snacks for the pool, we would take some of the other items listed, and added in rolled deli meat and cheese, pickles, olives. ( remember no glass at the pool so I just would throw some in a baggie) Something that they could grab and eat all along. Bring some juice boxes, soda, water whatever. We have a soft sided collapsible cooler that we would carry along to the pool. We still do this now that its just us. But now we include adult beverages, with our grown up snacks
