In China nearly everyone has a thermos or some kind of bottle for water or tea. My students often have them in class. No one drinks water from the tap here, and there are no drinking fountains like we have in the US. Offices and homes will have water dispensers with 5 L jugs on them from a local drinking water supplier. I've gotten in the habit of carrying a water bottle with me, especially while teaching. Talking makes you thirsty! Plus, the summers here can be very hot and staying hydrated is necessary.