have a drink. give it time. not that cider can't turn to vinegar, but the 'my cider is going to turn to vinegar' panic is right up there with the 'your homebrew is going to poison me' panic.
to get vinegar you first need alcohol, then acetobacter and oxygen. from my few endeavors intentionally making vinegar, it takes quite a bit of oxygen.
if you do get vinegar, age it out a few months, bottle it in a cutesy way with some juniper berries or whatever, tie a ribbon on it and charge a frigging arm and a leg for it at a farmers market