When I first started on LT 2 weeks ago, I struggled to get to 3 Litres of water. Now I am approaching 4 Litres (in my experience, I have had to condition myself to gradually increase the water intake over time to near as 4 Litres consumption). I can't manage tea without milk, so I go without, and substitute with my water allowance instead. I tend to sip the water throughout the day, although I do have my thirsty moments like in the middle of the night, I find I have to drink a full glass of water, before I can get back to sleep again!
Liz