A couple of decades ago, before our obsession with bottled water, it was not unusual for hotel rooms to have a separate, plumbed feed of drinking water ( as an extra line in the bathroom sink). Now that's never seen, not even in new builds.
I prefer my own insulated water bottle, and would fill it for use if a clean source were provided, but now the only source is the bottled water in the room/lounge, thereby defeating the purpose from an environmental perspective.