In a short answer - yes it can be treated. Usually with treatment that includes a self help program (AA) and therapy to learn not to drink and ways of dealing without drinking.
The first phase is the treatment of acute effects of alcoholism, called detoxification. The second phase involves learning how to live with the disease of alcoholism.
Because many alcoholics have very stressful lives (because of, or leading to, the alcoholism), many of the treatments for alcoholism involve dealing with and relieving stress.
With oral-rehydration-solution (a combination of salt and sugar). If severe, with intravenous crystalloid solution such as 4% dextrose, 1/5 normal saline. If the hypovolemia is due to blood loss in...