You can buy of box of single serve bags of breakfast Chex mix (they have several varieties--banana bread, cinnamon and something else, I think), raisins, dried apricots (or other dried fruit), single serve cups of applesauce, single serve cups of fruit cocktail or diced fruit.
By the way, we found that cereal with milk worked out fine (had a collapsible cooler in the room for milk). If you didn't want to deal with a cooler, you could get the milk at the resort gift shop or food court.....for that matter, you could take your cereal to the food court and get the milk there and eat at the food court tables (they had disposable bowls and spoons there).