You generally want to take Bentonite separately from any herbs, supps, meds, etc...it absorbs some of their properties...so you might not get as good results if you mix it with the caps. But you could always try it...no harm there.
Chewing helps to stimulate peristalsis...some people's digestive system really shuts down while fasting...you might want to try the p&b shakes again when you're eating.