Water sanitation devices are not making it to the places that are needed but instead find themselves on the shelves of Walmart. As water becomes more polluted around the world and with the ongoing problems in 3rd world countries we need a cheap and easy way to filter water for drinking. The idea is to use materials that are indigenous to almost all areas of the world to make a filtration system anyone can make easily. The filtration system will have to be capable of handling both chemical and biological contaminants.
Ceramic water filters meet your requirements and are already being made: https://keithfromcanada.wordpress.com/2013/06/18/to-save-ten-million-lives/