You can bring in a water bottle, there's a few fountains and a fill station by the condiments. If you leave, they have someone at the gate that can stamp your hand, and don't remove the wrist band - that will void it. They have a snack bar and "gift shop" which is really just candy and ice cream. You can do a meal deal purchase at the gate 5 for $20 or something, but you have to ask and pay ahead.
You can't bring in food or drinks but I'm pretty sure you can leave and come back though I would ask the staff there first
You cannot bring in your own food or drinks.
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