Clean drinking water is an essential prerequisite for good health. In a country like India, where 21% of communicable diseases spread through unsafe water, and more than 500 children under the age of five die each day from diarrhoea, the accessibility to clean drinking water is paramount. Researchers from the CSIR-Indian Institute of Toxicology Research, have developed a frugal water purification system, Oneer, to help overcome our water woes.