Acid is released in stomach soon after eating on empty stomach. Does stomach also release acid upon drinking only water on empty stomach?

Can not control it. Acid is made in the stomach all the time. So do not worry about the effects of drinking/eating food. This is a physiological function which you can not control . The only thing that can stop it are antacids which can shut off the production of acid in people who have acid related symptoms like Heart burn from Acid reflux. Tell us more about your problem...what are you trying to do to your acidity?