I try to eat as much as I can for breakfast, though nerves usually make it difficult to eat much the morning of a comp. Try to be sensible and have a good breakfast, though, don't have two boxes of Pop Tarts and call it good. I take a gallon of water to the comp, with 2-3 bottles Powerade, fruit, snickers bars, a protein shake, almonds, pb n j sandwich, to snack on throughout the day. Generally will toss a couple of beers in the cooler for post contest, but that is a personal preference, and not necessarily sound advice.