We drank raw water all through the Sierras, San Bernardinos, San Gabriels, etc., and never had a problem. I understand that is no longer safe to do.
Giardia! I drank well water at a rural ranch while 4 months pregnant. The few antibiotics I was allowed to take didnt do it, so I got to keep giardia for the duration of the pregnancy. Fun. My immune system finally fought it off 2 weeks after giving birth.
My wife’s case of giardia helped solve a missing person’s case.
I have thought of marketing capsules of giardia as a guaranteed 20-lb weight-loss product. Probably wouldn’t be much repeat business, though.
If people like drinking the water in Mexico they will love drinking that $36.99 bottle of water here.