I'm lucky here...I have a travel account and no restrictions on when/where I can use it.
But for all football games our boosters provide meals for the students. Usually it's pretty simple pizza (2 slices per) with a can of soda/water. Our local pizza shop gives us large 1 topping for $5 in exchange for a read over the PA at the game. So in total it's about $2 per student. It's not a big "meal", but I explain to students/parents that it's not meant to replace dinner just hold them over until after the game.