How did humans survive before we understood that we had to boil water to drink it? Was there just less bacterial disease in ancient times and or were human immune systems considerably stronger than they are today? : AskHistorians
https://www.reddit.com/r/AskHistorians/comments/w5b77n/how_did_humans_survive_before_we_understood_that/New device can make hydrogen when dunked in salt water | Ars Technica
https://arstechnica.com/science/2022/11/waterproof-clothing-concept-used-to-make-hydrogen-from-seawater/Sunlight to solve the world’s clean water crisis - News and events - University of South Australia
https://www.unisa.edu.au/Media-Centre/Releases/2021/sunlight-to-solve-the-worlds-clean-water-crisis/The Uranium Industry Continues to Poison U.S. Groundwater — ProPublica
https://www.propublica.org/article/uranium-mills-pollution-cleanup-us