If you're looking for an awesome water bottle, the best one on the market is definitely the one from S'well. It's composed of non-leaching and non-toxic 18/8 stainless steel, which will keep your drinks cold for 24 hours and hot for 12. To top it all off, they look pretty stylish too and tons and tons of brands (from Equinox to J.Crew) have been doing collaborations with them for special and unique looks. You can snag one here or here -- they're $40 -- which is definitely on the expensive time -- but well worth it. They make a terrific gift too.