I would for sure take stuff for snacks and lunch at the ball park. Be sure that you have a really good cooler and fill gallon size zip lock bags with ice to keep things safe. The ball parks can get very hot. I would take two coolers, one for food and other full of bottle water and drinks. You can do lean meats, low fat cheeses, yogurts, fruit, veggies, etc. Lots of snacks for the rooms too. I however would not try to take meals for dinner. The team boys are going to want to hang together and you want your son to be included. Many times the families decide to order pizza by the pool and let the kids swim. I would look more towards ordering low fat/low cost wherever the team eats. Share, order salad, water, etc. Fill in with snacks back in the room if you need too. Your son will thank-you for helping him stay included.