Vessyl can tell you exactly what you're drinking
                                
                                
                                    (Newser) -
                                    It took seven years for startup Mark One to finally make its big product reveal: the $199 Vessyl—a cup. But as  Valleywag  notes, it's not so much a cup as "a 13-ounce, Bluetooth-enabled, smartphone-syncing, battery-powered supercup." It works like this: Fill the Vessyl, which looks something...