You need to go back further than this to prove "fresh grape juice" had a long "shelf life". Was it "fresh grape juice" Melchizedek brought to Abram? Was it fresh "grape juice" used at the celebration of the returning prodigal son? We know they didn't celebrate this event, toasting with "grape juice", and we don't know if a process was known at this time to extend the life of presentable "grape juice".His Blood Spoke My Name said:Grape juice did not exist until after the civil war? That one can easily be refuted by reading the works of Josephus who lived back in the first century AD. Josephus wrote how one could make non-alcoholic wine from the juice of the grape even back then.
We don't know the "seasons" of these events, but we do know the "day and month" of the wedding when Jesus turned water into wine. The picking of the grapes was long past at the time of this wedding, so we know the wine furnished for this event was at least 10 months old. Scripture does not show preservation of "grape juice", or history to date, that "grape juice" could last but for only a short time before fermentation would begin.
Who is it that preserves us? Isn't it because of His blood that we are saved? If it saves us then it must condemn those that do not believe in Him that shed His blood for them also. In days to come there will be dead bodies all over the place, and blood galore. Interesting to see what drinking too much blood can do to something that is alive - "And ye shall eat fat till ye be full, and drink blood till ye be drunken, of my sacrifice which I have sacrificed for you", Ezekiel 39:19. Blood is represented by wine, and not grape juice.