And what was coursing through the veins of the grape in the cluster if there was no such thing as grape juice? Mustard?
The fact is, you squeeze a grape, today or in Bible times, grape juice comes out of it. It is not alcoholic in the least. And grape juice, as the Bible reveals, was called wine.
Isaiah 65:8 Thus saith the LORD, As the new wine is found in the cluster, and one saith, Destroy it not; for a blessing is in it: so will I do for my servants' sakes, that I may not destroy them all.