i use lots of water to keep from having a hangover. when im done drinking my alcohol, i drink as much water as i can before i go to bed, 2-3 glasses. then in a few hours i wake up to use the bathroom, then drink a bunch of water again before i go back to bed, then wake up in a few hours and so on till morning comes around and i have no hangover .

i read somewhere that a hangover is dehydration, thats when i started the routine of drinking lots of water after alcohol and ive never have had a hangover since.