Edited by Callimom - 2/11/12 at 8:31pm
You have 4 kids and left over cider? Why not just drink it at dinner/breakfast/lunch etc. It will be gone in less than a day.
I've found that cider doesn't need to be 'cold' unless its been open.
They drank 2 over the weekend.
We get it fresh from the farm - no preservatives and it's "open" because they refill our jug. And yes it is going off, and I would like to do something with it. The kids won't drink it.
I've had the same thing happen to me - buy an extra jug, either for company or because the kids have been guzzling it, only to find myself with slowly turning cider because they've hit their saturation point.
Unfortunately, I think vinegar is made from hard cider. The alcohol turns to vinegar, with the assist of a vinegar mother. I don't think you can use soft cider, but I may be wrong.
Perhaps you can use it in baking or cooking. It might be nice to add some to a muffin batter. Do you eat meat? I have a few chicken and pork recipes that use apple juice in the marinade - I bet cider would be just as nice.