In my opinion, you can never have enough water bottles. I always need one during a workout or after a run. This particular Camelbak Eddy Glass .7-Liter Water Bottle gets great reviews and only costs $8.99. It comes in a variety of colors, but you can currently only get it in charcoal for this price. The same item sells at Kohl's for $23.49. Get free shipping on orders $35+ or with your Prime membership.