It takes 9 to 10 gallons of water to make one gallon of beer*. This is a well known industry fact that is not widely publicized. That is just in the manufacturing process. This article talks about the water needed for the growing process, etc. Question is how much water is needed to manufacture ethanol.
* This includes water needed to clean vats, etc.
“It takes 9 to 10 gallons of water to make one gallon of beer”
Where does this water go? It just doesn’t disappear. H²O even at the atomic level is retained. Just like carbon is.