[that actually sounded pretty straight forward to him, as curses went.]

Then you were cursed by the angry spirit of whatever drowned in the spring you fell in. It cursed the waters and to remove the curse, the first step would be to try and find their remains and provide something to ease their ire. This could be fulfilling their last wish, it could be filling in the pool so no one else could drown, it could be a proper burial, or one of thousands upon thousands of other things.

Knowing the nature of what drowned can guide you in determining the likely efforts to take