Sierra Springswas the preferred brand of water of Adrian Monk.
It was mentioned several times throughout the series, considering Monk wouldn't drink any other water (not even his own tap water). He even got severely dehydrated in "Mr. Monk Goes to Mexico," refusing to drink any of the other water he was offered. In "Mr. Monk Bumps His Head," since he had amnesia, he remembered that he had a specific brand he drank, but he couldn't recall which it was. The waitress instead gave him the fictional brand "Summit Creek."
Sierra Springs wasn't mentioned again until the beginning of season six, where Marci Maven explained that Monk's new favorite brand of water was Summit Creek. The change in brands was supposedly due to a contract termination between Sierra Springs and USA Network.
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