I've found that ACV works the best for my acid reflux. However, I had to tweak the formula a bit.
I cannot stand the taste of straight ACV so I added fresh lemon juice in equal amounts to the ACV. I used to drink a tall glass of water but found that too much water triggered the AR, especially before bedtime.
Now I use apx. 6 ounces of filtered water and add 1 tbs. ACV, and 1 tbs. Lemon juice. If this mixture is too sour, just add a squirt of good quality honey. Some have mentioned adding baking soda. I never have, but if the acidity bothers you, it is worth a try.
I drink the mixture throughout the day and never before bedtime. I've even tried drinking it with my meals in place of other drinks.
Another thing that has helped tremendously is not eating or drinking after the evening meal and at least 4 hours before bedtime. I also limit my intake of liquids while I am eating to aid digestion. I've added more raw fruits and vegetables. Apples work really well.
I find that these things work best whenever I feel the first twinge or feel the acid coming up in my throat.