That is to say my belief that water is wet actually includes water as a constituent. It is widely accepted that most of our ordinary belief attributions, and attributions of other intentional states, involve wide content. In effect, the same predictive-explanatory psychological theory will describe me and my twin. Whatever I desire regarding water my twin desires regarding twater. Whatever I believe regarding water my twin believes regarding twater.
Content is causal.
Content is not wide. I have privileged knowledge of the content of my own intentional states. If content were wide I could not have such privileged knowledge of my own intentional states. Content is not wide.