Hmmm, sounds about the same as Bella has in the day and she's a mega-wee'er too.
Bella has a 200ml bottle ( ) in the morning - won't take milk from a cup, so sticking with the bottle for now.
Then she has 6 or 7 200ml TT cups during the day of very very dilute juice. When we switched her to water, she drank the same amount, so figured we'd stick to juice.
So she has 1400 - 1600ml in a day. And completely outpees all her nappies.
It's one of the reasons we've been so concerned about her fluid intake over the last few days as we've barely been able to get 1 TT cup into her, and her milk was sicked up.