Everyone should do this, and they should also have a silver cup.
Fun fact, silver is a universal antimicrobial. Silver travel cups should be the standard.
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Re antimicrobial: look into the germ theory.
Me and my brother talked about making silver chalices by hand after seeing a bunch of nice old silver dishes in a museum. Would be so cool.
Germ or terrain, whichever theory you subscribe to, silver cups are effective.