I made 20 L of apple cider this autumn using an electric juicer. I took the leftover pulp, added water to it, and made vinegar with it. I could have made 20 L of vinegar (or more even) if I'd had a big
enough container! I think I ended up with about 10 L altogether, and although it's light yellow, I'm perfectly happy using it in my washing machine (and in my
chickens' drinking water, our salad dressings, etc).
I have also made "scrap" vinegars by saving apple cores and peels in my freezer, then putting them in a jar and covering with water and letting them ferment. I searched for scrap vinegar
online, and used the instructions given by Kitchen Counter Culture. If you're eating apples all winter, that ought to be enough to make a new (small) batch once or twice a month. When I did this last year, I used it for cleaning and
chickens, but I'm sure it's absolutely fine for culinary use too