Anonymous
Also want to add, not exactly on topic but it pertains…
Any water filter can fail, even when you think it is working it can fail and you can drink contaminated water. It is also easy to accidentally cross contaminate into your drinking container bypassing the filter. Or you are in a situation without a filter, or where using a filter is obvious and strange to those around you. Like when visiting a city in a foreign country during urban travelling.
So I always carry in my medical kit some Loperamide tablets (Immodium) just in case my bowels become agitated. This helped big time when I spent 3 weeks in Russia in 2005, and 10 weeks in Brazil in 2010. Not to mention here in the states whenever I have had issues.