Obligatory disclaimer: This is not medical advice.  Consult your regular physician.  Use at your own risk.

Empty one envelope of vitamin C supplement powder (I like Emergen-C) and one envelope of Knox unflavored, unsweetened gelatin into a mug.  The Emergen-C is to make it taste better..

Fill with cold water, stirring briskly with a spoon.

Chug.

Do this two (ideally) or three (maximum) times a week.