Ultraviolet (UV) light is the James Bond of water purification. UV-C light scrambles the DNA of E. coli, making it impossible to reproduce. Without reproduction, the bacteria just gives up and dies—like a houseplant you forgot to water. You can buy a portable UV pen for under $100, and it works in seconds.
How to Eliminate E coli with Water Filters – Bluonics
One catch: the water must be clear. Murky water blocks UV light, so you’d need to pre-filter it through a cloth or coffee filter. That extra step is annoying, but so is shigellosis. Choose your struggle.
