As much as I despise dehydrophobia—the increasingly widespread terror of even the slightest sensation of thirst—I've got to admit, the phenomenon has driven the creation of some damn nice water bottles, one of which is the Purist Founder 32oz. It fits nicely in the hand, has a matte finish for traction, and is built extremely well. But so are about five hundred other bottles these days—what really sets the Founder apart is its glass-like interior finish that absorbs nothing, not one iota of any fluid, so that whatever you put in this thing tastes clean and pure (hence the company's name). Water or electrolytes one day, for a long ski tour; beer or wine the next, during a concert or ski-film premiere (yet another benefit of our collective hydrophilia: it's easy to smuggle booze, damn near anywhere). Either way, the double-walled, vacuum-insulated construction keeps hot beverages hot and cold beverages cold, for 12 and 24 hours, respectively. Finally, several color choices and the option of a built-in spout make the Founder one hell of an upgrade from your old Nalgene. $56; puristcollective.com.