You are allowed to take in plastic water bottles (ie Nalgene bottles) but no metal bottles (because of the no can rule). I nearly lost our Kleen Kanteens because I wasn't aware of that distinction. We'd taken them in several times before and it wasn't a problem, then one time the security person was stricter and said something. She checked with her supervisor because I was so surprised given that it had never been a problem before. Supervisor clarified the rule and said that we could take the Kleen Kanteens in just this once.
No problems whatsoever with food (or with knitting needles if you happen to be a knitter!)
Have fun at the game.