[Tagging] Feature Proposal - RFC - Free drinking water by private entities

[bkil]

I'd like to discuss three related proposals and two separate ones that
can be confused with the others. In all the below cases, the
availability is tied to the opening_hours of the containing POI.

Five separate proposals could have been created, but I feel that the
concepts and words describe these are so close, it is best to have a
good overview.

I'm open to suggestions both related to the tags themselves and how we
should structure and document this proposal in the wiki.

https://wiki.openstreetmap.org/wiki/Proposed_features/Free_drinking_water_by_private_entities