» Thu Jun 14, 2012 3:20 pm
To be more serious on the topic, the whole water business could be similar to what went on in the early Middle Ages. As they didn't have proper water ducts and sewers, everything got dumped right into the nearest patch of water without any sort of filtration. Excretement, bath water filth, dead animals, sometimes dead humans, garbage. So rivers running near a bigger settlement were usually only used by the poor to bathe, drinking was out of the question.
That was what the wells were made for. But a lot of well in a town either dried up easily or became lethal when a few animals or an unfortunate kid fell in and drowned, poisoning the whole thing. As said wells were deep, they couldn't really know if there was a corpse down there until a bunch of folk died drinking the water. That probably raised suspicion. Or not. People died all the time back then.
Drinking alcohol was considered much safer so people learned to live with the taste and negative effects of it.