Came across this app, "WeTap", which is a project of the Pacific Institute, in conjunction with Google Maps, to identify the location of public sources for drinking water. It is a fairly recent release, available for Android phones, and somewhat useless at this stage. But the concept seems good. With more people participating to identify the location of public water fountains nationally, a data base of public water sources with current operation, GPS coordinates, location photos, and Google Map position could provide a beneficial source of information available on your phone. Give it a try.