I have tried liquid ACV in some worse case scenerios with reflux, and it actually provided some relief. I have taken a tesp followed by a quarter or half glass of warm water. I never heard of the tablets/pills until now. Some people actually live by this regimen with much relief. Other individuals proclaim that taking ACV and Honey daily keeps them free of reflux, but I've personally never tried it regularly.
Many of these natural remedies will obviously work for some but not all.