Homemade vinegar supposedly has greater variations of acidity. Not surprising, since the conditions vary.
My homemade ACV tastes the same as the organic unpasteurized stuff I bought.
I think it took close to 3 months for mine. I used apples from my friend's tree. It will smell like apple jack at first. The juice first has to ferment, then it turns to vinegar. I covered my bottles with pieces of fabric to keep dust and cat hairs and such out.
It is definitely worthwhile to make your own. IMO.
I haven't actually tried to make my own, but one of my friends does and she uses wine-making yeast to get it going faster... it takes 3-4 weeks for her 5 gallons of juice to turn into vinegar.
I'm hoping to make some vinegar from some of the sulfite-free wine we are making! I have a bottle of rice vinegar with a mother in it that looks like a cork....it is a narrow-necked bottle and the mother reminds me of a kombucha scoby. Can I remove this and plop it into a jar of the wine?
I once had a bottle of store bought vinegar that I thought had gone bad and I threw it out. Then Ma told (yelled) me it was the "mother" and should have kept it. At the time I obviously wasn't very SS minded and didn't have a clue.
Now I know vinegar doesn't go bad and that cloudy looking glob is a good thing
(sorry, just thought I'd share that sometimes even store bought can get a mother)
But I will be trying this out later this season with some of my own apples.