One of the biggest contributors to digestive problems is that most people tend to swallow their food too soon, meaning, not chewing it enough/long enough. Chew more swallow less. That said, I've been using apple cider vinegar (ACV) for quite some time now and I suffered with very bad heartburn/acid reflux for years. Then I came across ACV therapy while researching H2o2 therapy. There's another therapy that will amaze you. H2o2 and ACV therapy make a good pair to draw too.
As for ACV and mixing it with something try about 6 oz of Pomegranate green tea and a table spoon of ACV. I personally use 2 about tablespoons. Mornings and late afternoons. When I first tried apple cider vinegar to combat my acid reflux (and don't let anyone tell you acid reflux is a disease, big pharma pushes this) I would take it straight. If this is new for you be ready to think you've made a mistake. Why? It will heat you up from your sinuses through your throat, esophagus into the belly. The vapors will make it feel like it's taking your breath away. Steel yourself and muscle through it, do not breath. Don't fret the heat you feel from it, it dissipates rapidly and you'll be amazed. This is my personal experience. I have had no acid reflux in 2 years. One slight case due to, guess what? "diet". I lost 25 lbs and I've kept it off for a year and a half now.
note: your liver/kidneys love apple cider vinegar. Every cell in your body loves H2o2. Research hydrogen peroxide. Food grade!