I'm definitely going to have to start carrying water with me. That's just too far to run in this heat, even when I've been hydrating. And though it may feel like it at 90% humidity, you cannot actually drink the air. I do have a runners belt that holds a water bottle. I'm going to start using it even on my short weeknight runs just to gets used to it.
The most important thing I got out of this long run was that I did it! 6 miles, average pace of 13:27 min/mile. I'm very happy with that.