Apparently, LL recommend a minimum of 4l per day and I know that Ice moose drank around 6l per day throughout his time on SS, but he's a man!!!
The official line given by Cambridge manufacturing regarding water intake is stated somewhere Where they say that they do not recommend more than the 2.25l of water per day, because, as I said there's no scientific evidence that consuming more water creates faster weight loss!
But actually, I think there may be some truth in it, so we'll see in the next couple of weeks!!