Dehydration

Unfortunately no, it will not prevent dehydration. Your body produces between 60ml and 80ml of urine per hour. You may consume more pure water while drinking, yet for each portion of alcohol you take it increases the rate at which you produce urine with an additional 120ml per hour. Regardless if you drink more water to compensate for that 120ml you lose per hour your body will not produce the hormone required to retain the additional water. You will only urinate more regardless of the amount of additional water you drink. You need to stop your alcohol consumption. However you will be better off than not drinking water at all but you will end up being dehydrated in any way.