I hear ya! I feel like I drink good amounts during the day but after 7pm I just can't get enough of freezing cold water. And of course, I'm up through the night to pee. My mouth just feels so dry!
I have been having some crazy thirst too! I get so thirsty I almost feel hungry so I make sure I drink lots of water and I've actually been drinking chocolate milk and gatorade when I need it! It's been helping quite a bit