How much money to bring to Orlando for 5 days?

I am a Junior in High School and our band is going to Disney World and Universal Orlando for some big competition down there and to take advantage of it and have an amazing Spring Trip. :) We are spending 5 days in actual theme parks (Animal Kingdom, Magic Kingdom, Epcot, both sides of Universal) and I will need to buy lunch and dinner each day. I need a rough estimate of how much money I should bring. I've read a lot of questions with answer like $1000, but I don't have that much to waste on this. I need to know the absolute least someone would bring for lunch and dinner these 5 days and some extra spending money. I don't need anything fancy like sit down restaurants or expensive souvenirs or what not, so pretty frugal spending.