Hey! Don't starve yourself! You need energy to cleanse! I eat cooked cereal for breakfast, maybe veggies for lunch, and I drink my stone-softening apple juice all day. (Perhaps you can't due to blood Sugar problems? Then cancel that, but otherwise, it keeps me very satisfied.)
Just eat lightly of good things. They say stop at 2 p.m., but I've eaten afterwards and it's been all right.