Wow, a 16 year survivor. Welcome to OCF. Back when I had dry mouth, I literally carried a water bottle with me from the time I got up until I went to bed in a water bottle holder and sipped constantly. I wish I could give you a more helpful suggestion from my personal experience..

My twisted sense of "tumor humor" means I do have a "unique" way to deal with dry mouth, but it is not practical nor recommended: develop aphagia instead of dysphagia like I did.
Since I cannot swallow at all, the almost undetectable saliva that is automatically swallowed without even noticing it by most people will build up suprisingly quickly to the point that I will never have dry mouth again. In fact, I am experimenting with a drug to cause dry mouth.

On a serious note, these OCF posts on dry mouth gave three different suggestions (just click on the blue and you will be taken to the post)
Nifty Dry mouth trick
dry mouth
Salagen
Hope this helps.
Charm