[Tagging] tagging drinking water of uncleaer official (signed) status

[Mateusz Konieczny]

We have drinking_water:legal=yes for water that is officially drinkable,
we have drinking_water:legal=no for water signed as not drinkable.

Do we have tag for water sources (amenity=drinking_water, drinking_water=yes)
that are neither officially or signably drinkable nor with "not drinkable sign"?

drinking_water:signed=no ?
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