I never "prep" according to the Moritz protocol. I may drink some apple juice for a day or so, though usually not even that. The only "prep" I do is try to avoid fats and heavy protein for a day or so.
The one thing I do without fail is to fast the day of the flush.
I don't take herbs, I don't worry about parasites, I don't do anything for my kidneys.
I drink the Epsom Salts
and take the oil/citrus. That's it. I have mostly had very productive flushes. Lots of stones and chaff. Only three flushes have basically produced what appeared to be almost nothing, and even those produced a little something.
I have done twenty-one flushes, and plan to continue.