In this Jan. 7, 2014 photo, a restaurant worker collects filtered water in a glass for a patron in Mexico City. Bad tap water accounts in part for Mexico being the highest consumer of bottled water and sweetened drinks. A law recently approved by Mexico City’s legislators will require all restaurants to install filters, offering patrons free, apparently drinkable potable water that won’t lead to stomach problems and other ailments. With an obesity epidemic looming nationwide, the city’s health department decided to back the water initiative. (AP Photo/Marco Ugarte)