From my expriences with Water Fasting and liver flushes, I have always done the Liver Flushes after I have re-feed for a little while. It is good to know how the intestines and the gall bladder works. The gall bladder releases bile when there is food in the stomach. The pressure from the food in your stomach, help release/push some of the gall stones out.
I did this and wrote it down in my blog, as I wanted to keep a re-feeding journal to help me in the future if I had question about how I felt or what I did. I did a Liver Flush 10 days after my water flush. It was successful. You might want to check out my blog, My Health Journey. It might help you get somebody else insight on the whole thing.