'Drink More Water' encourages the UK public to drink six to eight glasses of water a day.
The group has also called on UK water companies to encourage their employees to drink more water and visit www.wateraid.org/drinkwater, where they can donate money to projects.
The charity hopes this will spur donations for WaterAid's projects in Africa and Asia.
It is raising awareness of the water-shortage problem through a media relations campaign targeting NHS and water trade publications, women's titles and health-related magazines such as Health & Fitness.
The organisation said it was planning to expand the drive beyond water companies in the future.
One sixth of the world's population lack access to clean drinking water.