With your group, select a time period when you will run your event.  Anything from 5 to 14 days (or more) is great!  Mark your calendars and promote the event.

Now the challenge begins.  For the time period selected, replace all beverage (yes, even coffee) with free clean tap water.  Track how many beverages you don’t purchase.

Pull out the calculator and see how much money you saved by drinking only water.  Donate that money – or more – to help those who don’t get to choose what they drink.