I don't know the size of my shot glass - it was a standard shot. I'm guessing 2 ozs because it is not one of those tiny ones. It's the biggest one before becomming a "shooter" w/ a long neck.
I literally would take 1 full shot once a day w/ a meal. It burns like hell going down (obviously) but then was fine. After doing this for a month, maybe 2, that's when my stomach started having problems.
I dont' know if it was all the fault of the ACV or not. What I do know is I stopped taking that and the pain/bloating went away. After about 1 week I tried it again and later that night it came back. Since then I haven't touched the stuff.
I started taking it due to the great feedback I've read around the web. So I guess the moral from me is take it in moderation (1 oz or 2 tablespoons is probably fine). If I had to guess how many tablespoons I was taking I'd say at least 5. Which over time proved to cause some irritation, but who knows, maybe it wasn't the ACV and just a strange cooincidence.