So when you had this, what did you do? is it still there? or are you cured?
I'm not sure what is causing this, but I do know several people that I know ( including myself) had this problem a few months ago. It was the only symptom any of us had.
It didn't matter how much you ate or drank, it constantly felt as if there were a dry spot in the throat. I'm going to guess it's either dry weather related or possibly a viral thing.
In any case, you should probably see a doctor in case it's a polyp or something more serious.
On a side note, things such as anxiety can also cause a dry throat feeling.