Only thing I ever came up
with, to explain the water
to wine, was the wine was
only grape juice,
no alcohol in it.
With Jesus being a Jew, and this being a Jewish feast, there is no historical precedent of "grape-juice" being used...ever. Wine was very, very common in Jewish feasts, and Jesus even alludes to wine in several parables.
Even 2000 years ago, John would have known the difference between Grape Juice and Wine. He wrote what he saw. The Baptists (I am one) drink Grape juice at The Last Supper observance equivalent to RC Communion.....
Grape Juice was invented in the late 1800s by Charles Welch, son of a presybyterian minister who believed alcohol to be immoral. His invention was intended to allow his father's congregation to participate in the Last Supper.
In contrast, the Catholic Church considers grape juice to be an invalid substance for transubstantiation, finding that the accidents of alchohol (formal accidents, not DUI accidents) are essential to the offering.