Some popular OSM mobile apps have editing capabilities limited by adding POIs. My hiking buddy used POIs to add sources of water by OsmAnd, but I have doubts that it’s a good idea, that’s why I wrote this post.
Hi bormal, Yes, just add the tags as you have done with the iD editor, drinking_water=yes and it should be OK.
By the way, I wouldn’t join the drinking_water=yes, natural=spring node to the footpath node. That is unless you do actually walk through the spring. Placing it on one side or the other of the path would more precisely guide the water seeker, especially its difficult to find.