You don't. There is no reason given for why it doesn't work, but it is not part of the quest.
Not a thing, not even water.
apparently you can't/don't need to fix the fountain. it bothers me.
You don't fix the fountain. It is just one of many distracting items for the "blue hand".
Either no rain, or maybe the birds drank it all. (It is not part of the island quest.)
Well, actually you don't need to get it flowing. It has nothing to do with the game.
You don't need to. It's not part of the game. Don't worry about it.
It isn't part of the game. Perhaps someone turned the water off.
It will.
you have to take the underground tour
Counterfeit IslandNo, Counterfeit Island is real. In fact, it'd be better named as "Art Island".
there is no mansion on counterfeit island
You do not die on Counterfeit Island.