Keep your hydration on lock and stop using boring, plastic water bottles. Shop our wide variety of Calculus Water Bottles to express your personality and shrink your environmental footprint. People always say hydration is key for a healthy body, but so is personality. From workouts to office life, your water bottle can be a conversation starter or bonding experience. Plus, you'll always know which one is yours! Skip the bland disposable bottles and show off your unique style or mood with a water bottle.