[gfiorav]

The files under Maps/*.json seem to be generated via https://wiki.openstreetmap.org/wiki/Overpass_API

You can generate your own and rebuild

[throwaway425933]

Thx. Any instructions on how to "generate your own" would be appreciated.

[pvo50555]

You can try one of the Quickstart guides on that page. Just type in "San Francisco" in the search bar on the map on this page: https://overpass-turbo.eu/ and then run your search query (drinking fountains by default). The bounding box should be whatever is in view of the map on the right. Then you can click the Data tab to see exported XML.