I saw that in Lundin's book, and wondered if he had ever really tried it. He could probably do it in AZ, though, as Prescott sits at just slightly less than 35N and tends to get warmish in the summer.
"... they were drinking was the water most of they had been drinking all their lives... Travellers diarrhea was not a threat to them."
Dysentery is Dysentery, whether it is from parasites or bacteria. I was reading that approx. 2 million children die in Africa from lack of clean water. I guess the trick is to survive long enough until you're immune...
Sue