Why not get office buildings to install water fountains in facades as a community amenity?

A typical office building facade: 1700 K Street NW, Washington DC


An indoor water fountain and water bottle filler. A more robust design suitable for outdoor conditions would have to be created.

One of the new London water fountains outside Kentish Town tube station. Photograph: Luke Garratt/Greater London Authority

The Guardian reports that London is installing 100 outdoor water fountains in an attempt to get people to purchase fewer bottles of water ("Locations of 50 new London water fountains revealed").

For some time I've been thinking why not just install water fountains/fillers in building facades?

They can be supported from the internal piping system and it would be a community amenity and likely a lot cheaper to do and maintain.

Although in places without office buildings, free standing outdoor water fountains may have to be the primary option.