Since I'm trying to train up to longer distances so I don't die when I do the Tough Mudder, I don't think I can avoid carrying water with me on runs anymore.
I'm thinking a running belt will be fine for training, but I don't really want to be wearing one of those race day if I'm going to get muddy and wet within the first mile out of 12.
There'll be water stations, but in something that long, I probably want to carry an energy gel with me.