Currently I use a Nalgene bottle. I love how big it is but hate that I always manage to spill it all over myself while in the car or on the elliptical. Now it turns out these aren't good for you due to polycarbonate (#7 on the bottom) , which may leach Bisphenol A, an estrogen-like chemical.
I guess I have to buy a SIGG bottle. Which may take time to get use to since drinking out of aluminum is just weird.
I found this fun Glass Carafe from Pottery Barn. I love that its shaped like a plastic bottle.
Wait... I gotta go because Matt wants me to Ped Egg his foot. Its just wrong and its not going to happen.