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[stevea]

As a native speaker (though US English, not "the King's" or RP), a "bubbler" (what we Yanks call "drinking fountain") is a water tap.

Some of these "aim at our lips," some of them are "better suited in a downward direction, perhaps for hand-washing, perhaps for drawing into a hydration bottle...".  Both are water taps, hey, maybe water_tap as a value.

To me, it feels like "we either close or there," as I see a great deal of agreement, here.  I haven't heard a wider chime-in to my emphasis on "potable" (drinkable, if you prefer) but I think many of us mean that with a water_tap, even if we don't say it, I think we should.