Put a normal amount of grounds in one fourth the normal amount of water, cover, and let it soak at room temperature for 24 hours. For me this is 3/4 cup of grounds and one quart water. Filter and refrigerate the syrup. Discard the grounds. When you want a cup of coffee, mix one part syrup and three parts water and nuke it. This makes a superb low acid coffee comparable to Kona, and you can use the cheapest brand, whatever is on sale.
You need to get better advice about your problem, because your stomach produces hydrochloric acid, much more than is in any amount of coffee. Study some books about nutrition so you know how to eat right. Acid is definitely not a cause of any discomfort. My guess would be that you need more fiber in your diet, but that's only a guess. Whole wheat bread is the best source of fiber, two slices per day.
It is absolutely NOT low in acid. I do not have health issues but when I recently switched from Folgers to Maxwell House I began having bladder problems that sent me to the doctor. The pH (acid level) of what you eat DOES effect you regardless of the naturally produced acid in your stomach (unlike what was suggested in the previous answer).
Google can help you search for a low-acid coffee. Folgers was listed, though it may still be more acidic than other brands. Try to aim for one that is not chemically treated to make it low acid (apparently Folgers and Dunkin Donuts are not treated) as I imagine that may have its own issues.