Get into the water bottle big leagues with this one from S'well. It's insulated so well that it keeps your hot drinks hot for 12 hours and cold drinks cold for 24, but unlike other bottles, it doesn't form condensation (your hands get sweaty enough at the gym). A 17-ounce capacity with a vacuum-sealed cap locks in carbonation from fizzy drinks too. It's also BPA-free, non-leaching and nontoxic. Staying hydrated has never looked this good or been this easy.