Have you lived with bad water in many locations?
Yes sir, I have: Djibouti, Ethiopia, Kenya, Somalia, Somaliland, Thailand, Jordan, Lebanon, Saudi Arabia, Bahrain, Kuwait, UAE, Iraq, Azerbaijan, Cyprus, UK, a few places in the states, and now Okinawa ... each for different reasons, some worse than others. For some it was bacterial or viral, for others it was toxic chemicals, heavy metals, etc. I've had all manner of stomach bugs, and a few bouts of kidney stones as a result. In the horn of africa we took jerry cans to a central place and bought all the water that our lips would touch, or that would touch something our lips touched - smelled like pool water, chlorine content was so high. Not good for the body, but then had the same problem with drinking tabs in the military ... which is why they issue personal filters now, or logistics sends bottled water. The house we just left in Monterey had 100+ year old pipes, lead, arsenic, and all manner of heavy metals - folks getting odd ailments all over base. We ran an in line filter to get out a lot of it, then purified the left over with a different filter. Had a neighbor hospitalized for Arsenic poisoning from the tap water.
I've had great water other places in the US, and other countries, but its getting rarer and rarer. Berkey is a purifier, not just a filter, so it should be good no matter where the Lord takes us next, and the place I bought it from supports international missions so I like how they use their profits.