I've asked this same question and waiting for a response. I wanted to get more insight and have read some suggestions in other books that base their teaching on raw foods/juicing. The book that I read suggested at least twleve ounces of fresh juice. There are a couple of combination that seemed to work well for me....
*water balance and natural detergent cleansing is celery/apple
*powerful cleansing of intestines and removing excess acid, is pure lemon juice with 10 ounces of water.
I always wait a 1/2 hr to drink water after juice.
I'm starting my juice fast over again tomorrow.
I've read on a couple of sites that it would be best to hold off on carrot juice ijf you are prone to sugar levels. Spinach too if you have kidney stones. I'd imagaine b/c of the oxalates in fruits and veggies and it is one of the highest in spinach.
That reminds me of a thread that I want to create