For the first 24 hours, I can't blame her for not drinking unsure water- I probably wouldn't. After that....

All I can think of is that the "impure water" drum has been beaten so hard and so loud that people who don't know are going to err on the side of caution. It is like the little kids who get lost then hide from searchers becuase they've been programmed all their life to be afraid of strangers.