I have 19L of ‘wine’ from a failed experiment (refermenting pressed skins with water and table sugar). Its not completely bad (the kind of wine you serve to your least favorite neighbor) but it has a slight vinegar taste.
My plan was to boil it down a bit, then ferment with some organic vinegar with mother. Any better ideas?
I recommend Sandor Katz’s book The Art of Fermentation. Can you see these excerpts? (He basically says to do what you’ve suggested with some additional info about container shape).