'There's a wise-woman named Willowsong, who dwells by the Silverwater Spring. She may know a way to clean the befouled water. Draw a bucket of water from the well and bring it to her. Perhaps she'll know what to do.
'Take the road east from the town square to the Widow Froghorn's farm, then south to Constable Bolger's house. The Silverwater Spring is south-east of there.'
If you run too fast, you will spill the bucket and have to start over. Look out for white dots appearing around you and when they do hit insert to walk for a bit until they disappear.
Silverwater Spring can be found at 32.2S, 47.4W.