A diet with some difficulties?

you could bring a granola bar, or some wheat thins. And if you really want, you can bring a small lunch box with an ice pack and put some fruits or veggies in there that you really like. Or, you could bring half a sandwich and keep it under something, then eat it slowly so the teacher and nobody else notices, but only attempt this in a cl where you sit somewhere near the back of the clroom. good luck, and i hope i helped =]