Some people (me too) have trouble with Bentonite even with psyllium, so if you don't want to use psyllium, don't take it internally. It is used to seal well casings and ponds, so it will seal you up as well!
Bentonite is a good bath detoxifier, but it is a mess to use in the regular tub. I mixed some up and soaked my feet in it one night. A bit messy, but not as bad as the bathtub.