Chugging It Down

I went for a facial treatment yesterday that requires me to now drink 3 litres of water for the next 3 days! I don't know if I can actually chug down so much water! I couldn't find a 1.5 litre soft drink bottle in the house so I brought a 1 litre bottle instead. Am on my first bottle and it's half gone. Maybe I might hit my 3 litre mark after all, however, I'm sure lots of time would be spent going to the bathroom! :P