Next City offers a nuanced take on 'pure water' -- the system of selling plastic sachets of drinking water. 'Pure water' is the municipal water system of cities that don't have a municipal water system. Equally necessary and nasty, sachet water is, as the article notes, a grand conundrum -- simultaneously "a huge urban economy, its very own black market, an environmental disaster and a private-sector-driven public health coup."
Do laugh at the last quote of the article, though. While it comes from the mouth of a University of Miami professor, it's a great example of one of the favorite sports of West Africa--Nigeria-bashing. I dey go Las Gidis many times, and I've never seen river water bagged as 'pure water.' Indeed, all pure water companies are registered with and inspected by NAFDAC--Nigeria's National Agency for Food and Drug Administration and Control--and I don't know anyone there who would drink any bag of water that didn't have NAFDAC certification.