why wouldn't it be called juice instead of wine...I do believe they knew the difference

I don't think with such a popular topic (since a lot of people drink) that the bible would be vague on what the miracle actual was, that of making wine out of the water. I don't believe it was juice. Gluttony is also a sin, but because we're having a feast it's ok to have a table full of food?

I think this is one of the situations that shows that God gives us a choice. I believe he turned the water to wine, not juice (which proves Jesus was black! jk) He left the moderation of their alcohol intake up to them. Wine seems to be accepted only when self control is involved.

There's a difference between me having a beer because I had a bad day and having a beer at a bbq.