Hey!! I'm starting the Master Cleanse, too!!! Probably this Friday. I got a laxative tea at Walmart. I think it's called "Smooth Move" ha ha ha I haven't tried it yet since I haven't started the MC. But anyway, that's where I got mine and that's brand I bought. Good luck with the MC!!!
Sorry, I just realized that I didn't even answer your question. Yes, your stools will probably be loose/watery. From what I have read regarding the MC, that is normal. I think they call it "buttpee".
Sorry to be gross.