Targeting water as a strategy has been reported in various countries, even Africa. Results are famine, pestilence and disease. Has occurred in countries in conflict with the u.n. according to various reports. Not specified by what means. Results can be migration on a large scale as in Syria, and famine and disease as in Africa. Ebola may have originated in the Ebola River. Said to have originated nearby. Not known whether the water has been checked.
In this age of viruses, wells are thought to be the way forward and to help people find resistance to disease. Clean water is needed for food crops and for washing. Washing with contaminated water will attract viruses such as corona virus and other germs and flies etc.