I'm on day 12 too!
I am managing to get 4-5 litres of water down me IN ADDITION to the 'shake/soup water' and the water I use for my coffee, so in theory I am doing well.
I keep reading that the 'extra' water (i.e. more than the minimum 2.5 litres) speeds up/makes for greater weight loss, but I am confused as to how that can possibly be so. I have read on here that it helps alleviate hunger pangs and gives you something to do with your hands other than stuffing food into your face! However, there must be more to it than that. Something must be happening at the biochemical level. Anybody have any idea (in layman's terms!) what it is?
Feeling great so far and lost 12lb in my first week (but then I am hugely overweight). Wish I'd done this years ago!