Last trip we shipped a box of food to our hotel. It was there when we arrived. Do a search here on the Dis and you will find lots of info on shipping boxes to your resort.
Anyhow, for portable food ideas (non-refrigeration)... those tuna kits (tuna, crackers, mayo) are great, peanut butter and crackers, granola bars, bagels, pretzels, popcorn, apples, bananas.
If you have a fridge or cooler you could add.... cheese/cheese sticks, hardboiled eggs, yogurt, carrots and dip.
HTH...........P