Proper hydration is the difference between winning and losing once the mercury climbs over 80 degrees. Nalgene Bottles are the standard by which water bottles are judged, but my one complaint was the wide mouth. The act of concentration required to keep from pouring water or sports drink down the front of my shirt is the last thing I need when I'm hot and tired. But Nalgene now has a 32 oz. bottle with a narrow mouth perfect for sipping. These beauties are made of transparent Lexan, which imparts no taste, won't stain and is almost indestructible. Dishwasher safe in the top rack, the bottle has the top attached and is guaranteed not to leak. If you play a lot, you should buy three.