No, I didn't use apple cider vinegar. I tried before, but it was so terrible, I felt like I would go into a permanent convulsion.
I learned of the cider (unpasterized) fast from a book by Dr.Christopher, an herbalist. It was 10 years ago so I may not remember everything. It is for making your system alkaline. The first morning you drink 16oz of prune juice to clean out your bowels. Then over the day you drink (I think) 1/2 gallon apple cider and 1/2 gal water. I didn't lose much weight on the cider fast. The next time I did it with carrot juice and did better.
Hope that answers your question.
Day 3 and going strong!!