If you have the powdered Bentonite clay then you must hydrate it first, before measuring it out. Make a paste with water, then add more water (its WAY easier to buy the hydrated bentonite!)...etc until it is a liquidy yogurt consistency. Then use 1 tbsp of Bentonite clay.
That's it!
And I'll just tell you that I used 1/2 a litre of the Bentonite Clay and half a 150 g jar of whole husk psyllium in 9 days. I took the B&P drinks 4 times a day.