The difference is not just taste >>ALL<< bottled juices hafta be Pasteurized by law which means heated and this destroys the live enzymes which are essential to the efficacy of the cleansing process. Add to that all the time that the juice has sat in a bottle unrefrigerated  in some warehouse or grocery shelves plus oxydation in the processing further depleting the juices of it's nutritional properties. The lemon juice is not only essential for it's cleansing and alkilinizing properties it is also providing most of the vitamins and nutrition during the cleanse. All this  simply makes it a no brainer that bottled juice is NOT the thing to use when one is trying to cleanse the system and the juice is the main source of nutrition during the cleanse. We ain't talking no rocket science here either. Just plain ole common sense.

On an emergency when I forgot my lemonade when I left the house I bought some of that very same Santa Cruz organic yada yada juice and some maple syrup when I was out and about and was going to be gone all day from the house. I got to tell you after drinking fresh juice for several weeks using that bottled crap tasted like drinking battery acid and I could barely choke it down. It takes me all of 5 minutes to squeeze all the lemon juice I need for the day in the morning so besides all the common sense stuff regarding nutrition and live enzymes there simply is no excuse not to use the fresh lemons,