I couldn't find any documentation that clean water isn't healthier than dirty water for everyone. It appears you can never get completely used to dirty water, you would always be susceptible to disease from it. Here are a couple of articles on the need for clean water for everyone:

http://www.scielosp.org/pdf/bwho/v79n10/79n10a14a.pdf

http://webworld.unesco.org/Water/wwap/pccp/cd/pdf/educational_tools/course_modules/reference_documents/issues/thehumanrighttowater.pdf

Here is Wikipedia article on clean water:

http://en.wikipedia.org/wiki/Clean_water

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