If you love coffee, then you may live on the near edge of stomach distress. "Can I stand one more?" is the question you ask when you're about as acidic as you dare to be.
Rinse a small pop bottle and put a teaspoon of baking soda in it. Fill with water. Taste it. It should be just a little "salty".
Put a little glurp in your coffee before you drink it, and the acid will be gone before the coffee hits the stomach.