A quick Google for charcoal and chloramine gave snippets like:

- There are three approaches to eliminate chloramines and to prepare water for haemodialysis: (i) activated charcoal; (ii)

- Chloramine Removal from drinking water using activated carbon

- Contrary, water that had passed a charcoal filter or a mixed bed deionizer contained no measureable chloramines

- They say activated charcoal will remove most of the chloramines

Charcoal is good for volatile organics, but I wouldn't expect it to take flourides out any more than I'd expect it to desalinate the water.