There will be disagreement on what is necessary and what is not. I have never prepped a Liver Flush with apple juice or mailc acid. At most, I had an apple or two. Usually, not. I eat light the day before. On the day of the flush I start with oatmeal. Sometimes I mix in an apple, sometimes I don't.
As far a candida, it's not something I have. But, I discovered accidently that trying a coffee enema knocks stuff out that didn't come out with a normal salt water enema AND that an ACV enema really knocks stuff out. I'm not sure what it is that is being expelled.