Does apple cider go bad?
If you push it too far.
Apple cider vinegar, is apple cider that has already 'gone bad'
and since vinegar in itself is a preservative, it is not possible
for it to become 'out of date' or 'go off'. The worst that can
happen is it may lose some flavour over time.
I have been using a huge 4 liter container of apple cider
vinegar that I have had for over 3 years, it still tastes
wonderfull, and I have never had any problems with it.
So in essence, no Apple Cider vinegar cannot go bad.