The brand I use is Bragg's. You can actually buy it in most large grocery stores (you don't have to go to the granola store) The directions on the bottle are kind of odd. Here's what I do most of the time. As soon as heartburn crops up...usually in the evening, I take a tablespoon of vinegar and wash it down with some water. Another thing you can try is taking a tablespoon in the morning, and another one in the evening. This will keep the heartburn and acid reflux away.