Unfiltered and untreated water from a natural spring might sound like an elixir, but health experts warn that drinking so-called “raw water” could end with a trip to the doctor, or worse. “Raw water” or unsterilized water bottled directly from a natural spring, is becoming a sought-after item in California and parts of the U.S., according to the New York Times. The water, which can sell for around $40 for a 2.5-gallon glass jug, is often free of the any water filtration processes that some “raw water” advocates argue strips natural water of probiotics.