Master Cleanse? Sure! It's a great idea too! :) I never did the MC, but I did drink a lot of the lemonade along with my food one time when I had a bunch of organic lemons. It seems to be very high in Calcium and helps balance pH. You can basically do anything while Zapping. It's best to eat healthy, drink lots of water, and in some cases replenish good bacteria - Kombucha is a great way to go. Consider the Zapper a plus to anything you can do to heal your body.

edit- Oh yeah! :) You can get a good Kombucha Mushroom at http://www.kombuworld.lm77.com