I don't know about the tablets, but Dr. Schulze 's formula #2 has the Bentonite clay in it and it is in powder form.
Sonne's makes a very good liquid Bentonite clay (http://www.sonnes.com/)
I buy the Sonne's #7 liquid Bentonite clay at http://www.vitaminshoppe.com. They have a good price and good fast service.
I also get the Yerba Prima Psyllium Whole Husks from the Vitamin Shoppe. Even with the small shipping charge I found it is still cheaper buying it online and having it shipped to me then finding and buying it local.

I found the the Sonne's #7 works better for me.

I have used the formula #2 in the past but it clogged me up more than it cleaned me out.
The directions say to mix it with water or juice and drink it. I found that if I mix it with water and let it sit for about 30 to 40 minutes before drinking it works almost as good as the Sonne's.

I hope this may be of some help to you.