Note: Please consult with your physician before beginning training for an eating competition.
Six weeks out: Begin preparing for the competition by expanding your stomach with water. Drink as much water as you can in a short period of time (say, 3 minutes), increasing the amount in each training session. Take an every-other-day approach, giving your body rest on the days off. You can also use the same approach but with fruit instead of water.
One week before: Now is the time to focus on technique and strategy. Sit down with some actual pies, as similar as you can get to the ones you will be eating in the competition, and figure out how you will eat them. Make sure you know the rules of the competition and eat accordingly (i.e., are hands/knife/fork allowed?).
18-22 hours out: Eat a max-out meal, consuming as much food as you can in one sitting. Focus on low-calorie, high-fiber foods such as fruits and vegetables. This should be your last meal before the competition.