Clean drinking water is one of the most important prerequisites for good health. The Evangelical Presbyterian Church in Ghana (EP Church) is therefore promoting a simple method of producing germ-free water in its congregations. Typhoid and cholera are life-threatening diseases that affect millions of people worldwide every year and kill up to 300,000. The main cause is contaminated water.

SODIS is the abbreviation for Solar Water Disinfection. This process was developed by the University of Zurich and its effectiveness has been scientifically tested. A PET bottle is filled three-quarters full with water. When it is then shaken, the water absorbs some of the oxygen that is still in the bottle. The bottle is then completely filled, tightly closed and left in the sun for at least six hours, or up to two days if it is cloudy. As PET plastic, unlike glass, allows UV light to pass through, the combination of high UV radiation and a water temperature of around 50 degrees largely removes germs from the water. EPDRA, the development department of EP Church, uses every opportunity to promote the SODIS method. Information events are also offered for pastors and church council members. Primary and secondary schools are also involved in the program.