Local here... it's been hitting in the mid 90's everyday... plus the humidity so this is something to think about...and it does not take that long for all the ice to melt, and/or your food to go bad... this is a no no... Plus with the heat you will not want anything to heavy on your stomach, not a good combo at all..
Depending on where you are staying if you have a microwave, and a fridge..
When planning like this, I like to just go stand in the grocery store aisle, and really look at what you can get and what will work for your needs.
So I would opt for eating breakfast in room... Cereal, Milk, juice, pop tarts, breakfast bar, packaged muffins. Belvita makes a bunch of different things that you could use for breakfast and in the parks, and are filling... maybe add in some fruit like bananas, grapes or apples, or those clementines or fruit cups.. oops almost forgot... yogurt and oatmeal is another option use hot water from the coffee pot.
What to carry into the parks - Protein bars, nuts, dry cereal, dried fruit, fruit roll ups, gummy fruit snacks, Belvita cookies.
Other items for the room, ramen noodle soup packages or the bowls, you can use hot water to make them from the coffee pot.
You could get some sandwich stuff for in room, keep it simple, and get only what you need. Chips, Crackers, deli meat and cheese, PB & J.
Another thought you will need some type of container to keep your items in and from getting crushed, in the back pack... Dollar tree has alot of options. Some type of ziploc bags. While I really don't like Pringles the canister will hold up in a back pack. Don't forget the hand-wipes.
You can always split meals, both at QS and TS restaurants, order appetizer platters and share if you need more you can add in a side salad, or get dessert.