Replied by Ted (Bangkok)
If the body is already severely or lacking in bicarbonates, and you take Apple cider vinegar straight, the body will breakout in some cases since the body could not buffer the pH quickly enough and as a result cause inflammation.
Therefore, the best ways to deal in an extreme buffer deficiency is to at least take 1/4 teaspoon of baking soda in 1/2 glass of water taken twice a day for at least 2 weeks.
On the third week, you can only take 2 tablespoons of apple cider vinegar with 1/4 teaspoon of baking soda in 1/2 glass or 1 glass of water (safer), taken twice a day from then on.
The reason for the long term acid reflux has to do with inability for the body to stabilize its pH and whenever that happens the body breaks out in inflammation much like a weak acid burns.
If there is the issue of chemical toxins that accumulates in the body, such as mine a couple of years back, taking 3-5 drops of 3% hydrogen peroxide in 1 glass of water in the morning with 1/4 teaspoon is another possible detox remedy to reduce the inflammation. Of course this remedy you can consider if the straight bicarbonate remedy is not working well for you due to chemical toxins buildup. It takes about 2-4 weeks to neutralize the chemical toxins enough so that it doesn't get in the way of healing.