Why not the kitchen sink? Recognize the fingerprints, turn on the water to that person’s preferred temperature. It can use regular water by default, but switch to filtered water when it recognizes a pitcher or cup. It could even internally divert the stream for a second to ensure only filtered water hits the cup.
The car manufactures seem to love to continue to add all sorts of things into the cars that distract people from keeping their eyes on the road and avoid killing others.