water squirter is easy, it has just become disconnected. You will need to take off the inside panel of the tailgate to get to it, four scrws IIRC and a sharp yank upwards is all that is needed. I does feel like its going to break though, its well gripped.
The motor had probably seized on the spindle, which will mean taking it apart, take off rear panel as above, take off rear wiper arm, undo the bolts securing it to the body and its off. Ig you then look at the spindle closely you will see a C shaped spring clip, remove that and the spindle should come apart. It is likely to be rusted and gunged up, but a good clean and lube should get it going again.