Before reaching the fairgrounds we stopped at the art supply store. I wanted to get some kind of water colors to work with. I found a really cool little kit about the size of a deck of cards. It came with a neat little brush that had a water reservoir in it, so I didn't need to carry a little cup of water or anything. It's made by Koi Watercolors. I really like little compact things like that. I'll be using that at the next Dr. Sketchy.
The brush pen I use (thanks to Rob Ullman) is somewhat similar in that it has a reservoir for the ink and doesn't require that you dip it in a bottle every few strokes. Pentel makes it. The ink is almost kind of waterproof. Here are the results: