In San Francisco, you can visit the Exploratorium, a fun, interactive science centre. If you’re thirsty, there is a water fountain toilet. All you need to do is reach over the bowl and take a drink. As a self-proclaimed water-nerd and water industry professional, I had to drink from the toilet. My husband, on the other hand, vehemently refused. I suspect his reaction is the more common reaction. Toilets are dirty and water that touches them is gross.