And by the way I realize that it is a stupid question and I never took it really seriously but it was more of a "what if" question.
liquor i wouldnt use it will explode... use wine or something low in alchohol %.. if not youre gonna look like this
What if you watered your marijuana plants with bong water..... Would it produce a THC rich plant? Comfortably Dumb
The alcohol would absorb some THC too so I wouldn't Beer before Bud, you're in the mud Bud before Beer, you're in the clear.
Don't do it man! My friends and I made a bong out of a vodka bottle and we had to use the last 3 inches of vodka in it as bong water, (which I think is like 30-40 % IF that) but it just burns the fuck out of your throat. And you don't get that stoned. You're better off smoking out of water, and buying alcohol you can consume instead of the potent stuff. Don't drink that shit.