I've done dozens of 3 day water fasts. You really don't want to go longer.
I found that the MCs benifits far surpass the 'h2o only fast'. You get nutrients and vitamins,while at the same time literally cleaning every cell and area of your digestive tract.
the ph of the factor of the lemonade breaks up the junk and helps to eliminate toxins while not weakening the immune system or putting the body under undo stress.
I could go on and on , check past posts for more reasons.