I just thought I'd offer some advice.
On the delux dining plan you get 2 snacks per day. In most food courts you can use a snack credit for things like cereal, oatmeal, toast, a side of bacon, a piece of fruit, or a bagel. If you are light breakfast eaters, that's all you need. You also get 3 counter service or sit down meals a day, so if you're hungrier than that, you can get a full breakfast somewhere. I wouldn't bring/send any snacks on the deluxe plan..I think you'll be fine.
If you think you do want/need something else we bring a box of pop-tarts and a box of little debbie powdered donuts for a quick breakfast. For snacks we bring trail mix, raw almonds or other nuts, candy (skittles or M&Ms) and maybe some 100 calorie packs or other individually sized packs of cookies/chips. To be honest though, we ended up bringing most or all of it home, with the exception of the breakfast stuff which we did eat as we were not on the deluxe plan.
Good luck!