I divide up what I need over the day. With my breakfast shake, I drink 2 pints of warm water - half tap water, half boiled water - much easier to drink first thing. That's 1 litre done.
I keep a pint glass on my desk and at times during the day, I go fill it and drink it - I can get through 3 or 4 of them now in the day - but the first day, it was a struggle to get through even 1.
I drink a little coffee and some peppermint tea - mostly to warm me! Drinking that much water makes me feel cold.
Then I try to drink 2 large herbal teas at night - in pint mugs.
At that stage I have defintely between 3 and 4 litres into me.
It takes building up to this, but now I'm thirsty if I don't drink this much!! After the first 3 or 4 days, the constant trips to the loo slow down a bit!
The first few days, I was literally counting the glasses to get me to 2 litres, but by doing that and keeping at it, it'll get a little more each day - I'm into week 4 now.