Well, judging by the bottle it looks like wine made from orange juice. Or maybe wine that has orange juice added perhaps. So that might make more sense. Plus these people live in a poisonous hell, so really, growing anything could be quite a challenge.
Imagine outright admitting that you abused the very comrades of the guy who's died and came back, probably fr revenge. The levels of stupidity of these people...
I guess the chance of this actually being interesting in that the Mary Sue protag does lose and does have to leave the school was never anything but 0. Sigh.