I went to EDC - New York last weekend, probably the best weekend I've ever had. So much fun.
- buy one of their metal refillable water bottles for $10, you can use it everyday you're there and it will save you money when you don't have to pay $4-5 for individual bottles time after time
- don't plan on using your phone while you're in there, with so many people in a fairly small space, your messages and calls most likely won't go through, at least not in any timely fashion. So don't lose the people you're with
- buy a few packs of individually packaged and wrapped chapstick and gum, they won't let you bring in opened stuff. and you'll need those two items
- try not to bring anything you don't need, it's a pain carrying a bag so just wear shorts with pockets and bring your ID, tickets, and cash
It's an awesome time, enjoy it