First of all, EDT is awesome. It works, works well, and it is fun.
But you must eat, Eat, EAT, or you will not add anything.
Rather than look at a "eat everything I can get my hands on" diet, think eating alot of clean fuel.
Make sure you get enough protein, but avoid alcohol and soda pop like the plague. Eat enough protein, and get enough good fat and carbs. Blahblahblah. There are plenty of articles on T-Nation to guide you. Do what they say!
Finally, if you really want to make every rep count, get in touch with Coach Staley, or better yet, join his forum.
It'll be worth so much more than it costs, and you will never regret a single week with access to it.
Train, eat, rest, repeat.