Six stone pots, each containing 2 or 3 ferkins or 20 - 30 gallons of water. Jesus, made 150 gallons of wine, a good average, give more than take probably. The Governor of the wedding noted the good wine was served last.
The Bible does not note the size of the wedding feast. BUT, it seems there was a lot of wine. Adding the wedding hosts wine, with that made by Jesus. You take a 750.ml bottle and the amount produced by Jesus. You are talking about 800 bottles of wine, a good average number, give probably more than take. [ Some wedding, with very happy guests, I would surmise ].