Gastritis Support Group
Gastritis is a medical term for inflammation of the lining of the stomach. It means that white blood cells move into the wall of the stomach as a response to some type of injury. Gastritis has many underlying causes, from infection with the bacterium H. pylori, bile reflux, or excessive consumption of alcohol or certain foods or drugs like aspirin.

online i always read :
this treatment is the most effective when you consume nothing but coconut water for the first 24 hours after gastritis symptoms start.
but i have not found anything on how much u should drink on a regular bases ...