Water Bottle - Inside Bonnaroo there are about 5 or 6 filtered water stations. They're amazing; fill up often.

Flavoring - completely optional, but every once in a while the filter water stations are backed up and all you can get is the regular - which is fine, just has more of a sulfury taste to it. Buy a thing of Gatorade powder to bring with you; makes bland water delicious - plus you have more energy

Wet wipes - A godsend. Not only is it a way to clean up a little bit, but also a fantastic way to cool down while at the camp.

Goldbond - If you're going to be moving around, chances are you'll rub yourself dry. I've been told Goldbond is fantstic.

Bandanna - Depending on the water, here in Tennessee it can get super dry. Dry, hot conditiosn + moving people + disturbed ground = dust. Do your future self a favor and wear a bandanna or something over your mouth like a western bank robber. I think it was 2008 where we were going through a massive drought - for a few weeks after Bonnaroo I was coughing up all sorts of gunk that built up in my lungs.

Flashlight and toilet paper - You're going to want to use the restroom at night. In porta-potties, there are no lights. It's dangerous to go alone. Take it.

Porta-potties. Speaking of which. Keep track of these. If you see one, remember the general time that they come and go; it should be somewhat on the similar schedule every day. Nothing is better than using a recently cleaned porta-potty at Bonnaroo. Nothing.