My preferred method of making vinegar, is to first make wine, and then convert the wine to vinegar. Both steps may look like you are trying to breed the next super virus.
I know that my vinegar is done, when I taste it, and it tastes fully of vinegar! LOL!
If I stop the fermentation too early, then it's a mix of alcohol and vinegar. Yup, safe to consume.
If I let the fermentation go too long, the vinegar turns to
water. Tasting it has never made me sick. It's already been disinfected by alcohol, and by vinegar.
Vinegar production might stink up your house, or at least the room, closet, or cupboard where it is fermenting. Karma must be balanced, since making the wine smells so good. Hee hee.