Blueduck
Sorry that your post was waiting so long to be answered.
Any kind of plain psyllium will work. Whole husks is my favorite. It takes one tablespoon for each P and B shake. If you get powdered husks, use one teaspoon.
Sonne's #7 or Yerba Prima Detox are both good liquid bentonite. I have used both.
Lots of people here have used Primal Defense probiotics. If you take probiotics with P and B shakes, make sure to do it at least one hour away from the shakes, even better to wait two hours after or take it two hours before. I do not think the time of day to take probiotics matters.
You could also wait to take probiotics after your bowel cleanse. It would work better with a cleaner bowel.
Blueduck