Whitewater Snacks has good food at a decent price in a great setting. My son gets the pizza that comes with a salad, one daughter gets the chicken nachos, the other daughter gets chicken nuggets with fries, hubby gets a burger and fries, and I get a yogurt parfait. You will find something for everyone. You can relax indoors or outdoors, either way, it is one place we make sure to stop by every day during our trip. The Mexican take out (forget the name, I think Cocina )in DCA by Pacific Wharf has a huge chicken salad that is big, great tasting and filling for a few people to share. Tomorrowland Terrace has a few good items when you are in the park looking for breakfast. Hubby gets the breakfast burrito, two of my three kids order the breakfast platter with eggs, bacon, potatoes, and a biscuit the other kid picks something like the kid's meal or just a drink and I order a fruit platter. We all share and everyone is happy and full.
The Golden Horseshoe Revue, we order two or three orders of chicken nuggets that comes with fries and one or two orders of fish and chips (depending on who wants fish), and we share. Sometimes we only order 2 chickens, other times it is 2 chickens and one fish, it just depends on everyone's appetite.
Jamba Juice in DTD is a place we love to stop by when everyone is thirsty.