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Interesting. The only thing I have ever drank out of copper are Moscow Mules.

I'll be interested to see that link too. My current understanding is that copper overload is comparatively common, and a copper bottle would make that worse.

Good question. A site that sells copper drinking mugs (http://copperdrinkingmugs.com/are-copper-mugs-safe-to-drink-from/) recommends using a copper mug lined with steel or nickel. Unlined copper mugs should not be used with acidic or hot beverages. I guess I'll stick with my glass cups.