Depends on your spending budget.
We've been lots and tend to eat before we get there, and save up for the dinner splurge somewhere nice. Esp in Epcot where the food has a prayer of being nicer. The rest of the time it's typical "burgers & fries" type fare at Magic Kingdom and so on. Rainforest Cafe is attached to Animal Kingdom and the Yak and Yeti is fun to eat at -- but on a student budget in a group setting that may not be where the group ends up. I'm not sure how much freedom to get to be on your own or what the group thing has planned for the students.
I'd go with the decent continental breakfast, bring a water bottle because you can refill at any fountain and it gets HOT.
Remember you are walking around (I clocked 15 miles on my pedometer the last time I hit Epcot for the day), so that helps with travel food.
Just go with kid size meals, fruit, and keeping it real. Both on budget and trip eating. It's not the end of the world to have something you normally don't on a trip like an ice cream bar. But you don't have them for every meal either, right?
AND after when you get home -- travel food tends to have more sodium so if you end up with a few pounds of water retention from the sodium. Just keep drinking your water and it will clear up in a few days.
Don't use that as an excuse to derail "for real" when it's "just water weight" or get yourself into a whole emotional roller coaster of "OMG! I blew it on the trip!"
Just enjoy your trip for what it is and have a nice time! It's a fun step outside the ordinary for you! Hope your band trip is a blast!
GL!
A.