I'm curious, what would you then recommend for purchasing wine from a place that sells wine from their cask? This would be for direct consumption within a relatively short time. This isn't a kit or a fruit wine and not for aging.
The other option would be to get a 1/2 gallon growler and have them fill it up at the tap. But, like a regular wine bottle, the constant opening and closing and air space is going to oxidize this wine pretty badly, even for the short time. (like going through a regular wine bottle through 3 days x2.5)
Based on this, I'd prefer going for a air resistant bag, or heck, a freezer zip-lockbaggie with a spout, and to keep any new air from going in.
Most of the posts have NOT discussed the original intention, to buy ready to drink wine from a wine seller sans bottle. This is of course putting me at risk with the assumption that "sells fresh wine from their barrels by the liter" is a ready to drink wine.
Secondary: GF Czech Lager
Waiting to be kegged, Italian Primitivo
Kegged&Ready: GF Orange&Coriander, GF Honey Lager, GF chocolate ale, GF English ale, Island mist (zinfandel), Island mist (cbry malbec).
Bottled: Infected Mead, Dry Hard ciders, Accidental Sorghumwine, various unnamed.