In the Penn and Teller BS episode I was talking about, they filled bottles with tap water from a garden hose at the back of the restaurant, they then sold those bottles to customers eating. Not one of the people figured out that it was tap water and none of the people that tasted more than one bottle realized that they were all the same. The customers descriptions were classic. "This one is sweeter and has a hint of minerals"
In the US, (I assume Canada as well) tap water is safe, here in Asia I was actually afraid to rinse my mouth when brushing my teeth. We now filter it and drink it. I have never been sick from it.
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