I'm going to guess that you went to the Tropical Splash yesterday. Too bad you didn't say anything before or we could have gotten together.
Anyway, I find, though this doesn't do much good now, that having what you normally eat works well. You really don't want to be eatting things you don't normally eat. Though carbs are a good thing. I usually try and eat during the meet too, and drink plenty of fluids.
Hope you did well yesterday.
