Hi KS! If you are considering Bentonite and psyllium (my favourite way to cleanse my bowels...but if you tend toward constipation you might want to use Holistic Horizons or Schulze's) you'd better read these two posts...
I prefer 'Flora' Brand 'Indian Psyllium Husks' -whole husks (NOT seeds, though)(but probably any good brand will do - YerbaPrima?) And definitely get a hydrated, liquid bentonite.
If you are itching to do a Master Cleanse Fast...then you could definitely combine the Bowel Cleanse AND The Master Cleanse (that's what I did)
Of course...you can always go for the 'Ultimate Cleanse' which combines all three things...lemonade fast, bowel cleanse, and parasite cleanse. Depending on your condition, this might be right for you. But if you are sensitive, you might want to take it more slowly...
I hope I haven't confused you...but those are key posts to read - you'll probably be able to get an idea of what is right for you...
Definitely get back to us with more questions...we're here to help!