DD has always drank a lot of water (as soon as we finished bf'ing). She's now 2.3 and usually gets through about 4-5 full "sippy" cups a day (so about 800-1000 ml).
Its never really bothered me but now I'm thinking of potty training and obviously she wees a lot and her poos are also quite sloppy (sorry tmi). I also wondered whether I ought to get her checked out to make sure its not a symptom of anything else (she's seems perfectly healthy though, so I think not).
So .... does she drinks loads more than the "average" ? Should I just let her be and deal with the potentially messier than normal potty training ? I don't really like the idea of restricting her drinks but assume cutting down a bit wouldn't do any harm ?
I dunno but DS (2.6) loves his drinks. (although he goes for superdiluted juice) He can easily get through the amount you've stated and he doesnt have an 'off' button - he'll drink whatever you give him all at once - so I only give him the tommee tippee beakers half or three quarters full at a time. He asks for it throughout the day. Apparently he's the same at nursery with his water. I've never really worried, but I admit I'm worried about the potty too!