I started taking bottled Kombucha tea (not the teabag stuff) as an alternative to drinking Apple Cider Vinegar for acid reflux. The Kombucha brewing process is very similar (in fact, you can brew vinegar from it) and it has a similar concentration of acetic acids and probiotic organisms. I have found that, since I started drinking it regularly, my acid reflux has all but disappeared!
I find that I must drink at least 8 oz (1 cup) of Kombucha, twice a week, preferable on an mostly empty stomach. Depending on the severity of acid reflux, results may be noticeable immediately or within a few days.
I have been making Kombucha Tea for over 15 years and I have had two users of my tea who told me their acid reflux went away after a few days of drinking two 22oz. bottles of my Kombucha Tea. Made with Green, Black and herbal wild berry teas. Google "Kombucha Tea" for more info. Michael