If anything is added to a water-only-fast, the body will not conserve its food reserves in terms of minerals/vitamins and so on. Shelton referred to this as a "lop-sided-diet", and the risks of eventual malnutrition or deficiency diseases become apparent.
The most efficient and thorough detox is water-only-according to thirst with nothing added.
Enemas are also enervating and not recommended by many; they can also interfere with the proper functioning of the bowels post-fast as well.

Chrisb1.