A soda at M.'s cafe.

Whenever I am having an iced soda in a glass with a straw and no one's looking, I bend the top of the straw and bring it to the opening of my gullet, and sip. The soda does not come in contact with my tongue or with the interior of my mouth.

Try it, being careful not to inhale the liquid. It really quenches your thirst more than if you sip your soda the normal way.