Drinking water, in a building that happens to have exam rooms.
A dental practice break room is ordinary commercial drinking water. Dialysis, laboratory and sterile processing water is a different trade. We do not do it. That distinction is the whole page.

Medical building, not medical water.
These two get run together constantly, and they should not be.
A medical office building has a break room and a waiting area. The staff drink water all day. That is the same problem as any other office, and we treat it the same way.
Clinical water is something else entirely. Dialysis water reaches a patient's bloodstream across a membrane. It never passes through a gut, so nothing filters it on the way. It meets its own standards and is monitored constantly. Laboratory water is graded and measured, because somebody's published results depend on it. Sterile processing feeds autoclaves and instrument washers.
Those are different professions. Their own standards, their own monitoring, their own liability. We do not do them, and a vendor who offers to do both should worry you.
Break room and staff drinking water
Waiting area and patient drinking water
Beverage water for a staff kitchen
Dialysis water. Different standards, continuous monitoring, a different trade
Laboratory or reagent-grade water
Sterile processing, instrument washers, or any water feeding a medical device