Hello, For the 6 days preceding the first flush, we each drank about a liter a day of cartoned organic apple juice, (Libby's) and also had a tablespoon of lemon juice mixed with a tablespoon of olive oil first thing in the morning. From what I've read, this packaged stuff is perfectly fine for the softening up process and we had no complaints. We did the second flush two weeks later and only drank the apple for the preceding 3 days, (getting a bit fed up with it by then)
Not a great expert, having only done this a mere 2 times, I was a bit aprehensive at first but amazingly it works! We'll be doing it for a third time this weekend. Really should get out more.