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Construct outdoor drinking fountains out of materials that naturally resist bacteria.



Not sure why you were downvoted. This is both a good idea and is actually done: brass, which is commonly used for outdoor water fixtures, is naturally antimicrobial (including E. coli) due to its copper content: https://en.wikipedia.org/wiki/Antimicrobial_properties_of_co...


And if that doesn't work, what about just adding antibiotics to the water supply? It works for cows....




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