What was the brand of bottled water Adrian Monk consumed on the U.S. TV series "Monk" until he switched?

The brand of bottled water Adrian Monk consumed on the 2002–2009 U.S. TV series "Monk" until he switched was Sierra Springs Water. During the first five seasons of the TV series, Monk used Sierra. In the later episodes, it was changed to the fictitious brand Summit Creek.

Enthusiasts, industry professionals, and water sommeliers tell us that Sierra Springs Water is considered the best or one of the bests tasting spring waters that comes from a protected, free-flowing source. It is treated as little as possible during the bottling process. Known by geologists, it is water that has travelled through or on the surface of the earth with no help from machines.

Additionally, if the water comes from a borehole (a well), drilled next to a spring, it is considered spring water by the U.S. Food and Drug Administration. This is allowed if a hydraulic link between the spring and the borehole can be shown. The water from both the borehole and the spring are noted as chemically identical. The borehole will not prevent the spring’s natural flow. Using the spring’s natural orifice, which is done by Sierra, is preferable.

"Monk" is a comedy-drama detective series, created by Andy Breckman. It was produced by Mandeville Films and Touchstone Television in association with Universal Network Television. Tony Shalhoub as Adrian Monk is the top star. The series is a police procedural show and exhibits comic and dramatic tones in its exploration of key characters and their personal lives.