Never having set foot on Cow Island, here's my guess as to where Cow Islanders get their drinking water similar to most all islanders, and myself, too.
Drinking water is of the plastic bottled variety, or of the 3-gal blue, lug-a-jug municipal treated variety. Tap water comes straight out of the lake and is untreated lake water.
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 .... Banned for life from local thrift store!
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