The water one says safe for drinking water which makes me feel pretty good about it. Not sure on the regular. The stuff is amazing. I stopped a cracked tank from leaking while I got the new one drilled and set up. It actually bubbled out like bubble gum but didn't pop before it set.
Once fully cured, it's like rock. It doesn't break down or leech anything. So, actually better than rock, lol. Water weld and regular are like 99% the same recipe too lol.