Not just 4 drinking?
Northwestern researchers have discovered that polyphenols (naturally occurring in green tea, red wine, cacao beans) make for a superb antibacterial coating.
Polyphenols are sticky, which affords their ability to coat & adhere to virturally anything, even Teflon. They developed a method for producing multifunctional coatings that can be widely used 4 consumer, medical, & industrial. Ref. NW, 2014