Hi JD, Lowfers, Regarding bentonite, check at an auto parts store for what is put down to soak up gas and oil spills. You'll need to read the fine print on the bag, but a lot of it is bentonite based, and I'm sure you'll find some that will do the job. 73, J.B., VE3EAR LowFER Beacon "EAR" 188.830 kHz. QRSS30 EN93dr