2 litres a day is the recommended amount for one day so i've heard.
i'm not sure why i drunk so much..was just watchin tv and kept refilling my drink, and before i knew it...2 litres in one go!
its the day after now and i feel alright, so i don't think theres any lasting damage. think its wise to spread my intake throughout the day in future. let this be a warning to us all!