I don't really have anything to add other than "me too!" I didn't drink much -- only when parched, as you said -- and I've gained a few pounds on Colonix as well. Which is a bummer, because I was hoping I'd lose some weight, like all the people in the testimonials.
I don't know where you're at in the process, but I'm at the end of Phase II. I've seen some stuff come out like the pictures, but I really had to look for it/poke at it at times.
The weight thing has come up before in discussion, and there doesn't seem to be a lot of consensus on why some gain and some lose. It is interesting to see that you and I never drank much of anything before, though, and have experienced weight gain in the same fashion. The first respondent's theory made as much sense as anything else; perhaps we are absorbing better now (fluid, too).