If you're camping you're allowed to bring in as much bottled water as you want. And you HAVE to have a camping ticket to get in through the camping area.
If you're going into the concert through the regular entrance I would say, "Good luck with that." But, once you get in, you can buy one bottled water and just keep filling it up. I think I remember there being like water fountains or something.
Just spend the $2 for your first bottle. Then just keep filling it with the free water. It's not Evian, but it's not bad either. It doesn't get much cheaper than that. Plus it makes for less bottles to trip over at night.
“I wouldn't recommend sex, drugs or insanity for everyone, but they've always worked for me.”
We heard about people getting one bottle in per person from the camping entrance first day last year. So for sunday we each bought gallon jugs and thought, hey it's 1 bottle right? Probably overkill cuz they wouldn't let us in. So we screamed "Who wants water dumped on their heads" immediately 30 people formed a nice line and we began to pour. It was pretty funny.
Of course we were bone dry again in like a half hour though.
They do set up a water fountain, but the line's always huge. The trick is this (I shouldn't post this because everyone will use my trick) --
A) Water in the bathrooms is potable.
B) Right near the entrance, on the right fence with the bushes, there are a few spickets. I went there between every set to reenergize last year. Not many people know about them, they're sort of hidden. So do that.