Hi, Sarah - welcome to the gang. This truly is a great group of people (if I say so myself). I hope you find the same warmth, support and inspiration here that so many of us have.
As for water, do track it - you'll find it useful over time to be able to look back at your consumption. I've found that, not surprisingly, the more aware I am of water consumption the more I actually consume. And the more I exercise, the more I drink, too, as I try to get in at least 1-2 glasses before plus 12-16 oz. during each workout.
Enjoy SP and your journey. You CAN lose that weight for the last time - and find fitness, health and strength along the way.