Nalgene Water Bottle

Nalgene's wide-mouth bottle is ugly, indestructible, and does exactly one thing well, which is hold 32 ounces of water and not leak. BPA-free Tritan plastic survives drops on concrete, hot cars, and overnight freezing without cracking or warping. Wide mouth fits ice cubes and is easy to clean, and the lid attaches to the bottle with a loop so you can't lose it. At $12 it might be the best dollar-per-use product I own.