Fill a glass with cool drinking water.
Get a clean paper towel. (If you have no paper towels, a thin cloth will work too.)
Cover the top of the glass with the paper towel. Fold down the edges of the paper towel to completely wrap the top of the glass. Hold the paper towel in place by grasping the glass in your hand.
Drink a sip of water through the paper towel.
One sip is often enough; if not, take a few more sips