Yeahhhhhh, I'm thinking you got that backwards: "turning WINE into WATER" is probably the joke, as water into wine (urination after drinking) doesn't make sense.
Compare the infamous Archie Bunker one-liner: "You don't buy beer, you RENT it!"
And water into wine is recorded in the Bible because it was a miracle to prove that Jesus was who he said.
“water into wine”
Goes against the flow.
Thus miracle v. mundane.