Jack finds fountain of youth to be sulfer water
Jack goes after feather of phoenix next
The map, having various crazy shit on it, sort of guides him to the phoenix, but he needs to gain further passage from someone guarding the bird. They only allow access to the phoenix for benevolent purposes so he thinks "hmmm, who's recently died that I can claim this is for--oh yeah, Norrington. :D"
just make it so you can only get to it to "attone for responsibility in an unfair death" or some such
While this is going on- Norrington hitches with Will back and forth between the land of the dead