Pluto Water, a mineral water which is an important part of the story, actually exists in French Lick and West Baden. It was once bottled and sold around the country. However, due to modern knowledge, the water is no longer drank or bottled, as drinking it can cause sickness.
The film takes place at the West Baden Springs hotel, however the hallway scenes are filmed at the neighboring French Lick Springs hotel, due to the hallways at the West Baden hotel being circular.
Sprudle spring water is the mineral water from The West Baden Springs Hotel. Pluto mineral water comes from the neighboring French Lick Springs Hotel.