The organic/unpasteurized is ideal, and I honestly haven't had as positive of results when using the pasteurized, but there's nothing wrong with using the Heinz (or whatever).
But you don't have to buy Braggs, which is super expensive. You can make your own. It will go faster if you do buy...
I love ACV, too- I always have given it to my chicks, but for whatever reason I didn't give it to my last batch of chicks right away. And their mortality rate was WAY higher than normal. So to make up for it I'm adding the ACV and a little molasses until they stabalize again.
Besides all the...