J.R.
Hi M..
Congratulations on your pregnancy.
I see you live in Florida where it is hot still :) , I would drink as much as you need. It is good to stay hydrated under any circumstances Anything your body or your baby does not, you will pee (sorry!) out.
As for feeling run down, perhaps ask your dr about pre-natal vitamins. and daily slow walks in the nice fall air could help maybe.
Best of Luck and Feel good.