Hydration is one of the most important, and easiest to neglect, aspects of training. But new technologies that both regulate your beverage’s temperature and make using a bottle more convenient on the go can help keep you drinking before, during, or after a run. From easy-to-carry handhelds and flexible flasks to vacuum-sealed, insulated tumblers for keeping your post-run drink of choice (beer included) ice cold, these are the best bottles to help quench your thirst.