What can i use for a sour taste in mouth due to gallbladder?

You can : Try acid reducers, such as Prilosec or zantac, (ranitidine) but definitive solution for gallstones is cholecystectomy. Get your doctor's advice regarding surgery.

Reflux: You may have reflux, which is when some fluid from the stomach makes it back up the esophagus and into the mouth. There may be some chest pain/burning with this as well. Reflux is usually treated with antacids or medication such as prilosec, both over the counter without a prescription. Try one of those first. Gallbladder disease does not cause this problem.