I had rad/chemotherapy 2 years ago and have had a dry mouth ever since. I found that as a snorer my mouth stayed open during sleep which caused my mouth to dry out and wake me every couple of hours. Biotene gel helped but wasn't a complete answer. I eventualy bought a chin strap which kept my mouth more or less closed during the night. It was transforming (but not very sexy). Now I wake up in the morning and because I haven't been chewing the inside of my mouth because it was so dry, my mouth is in much better condition, I get to sleep most of the night, my use of Biotene gel has reduced and I feel much happier and my mouth is much healthier.
I also carry an atomiser filled with either water or a saliver replacement product. This easily fits into my pocket and can be used in emergency(when I forget my bottle, which I leave in shops,cars, people's homes etc) or places where a bottle is intrusive.
I have been having physio on my neck, which had been welded rigid and swelled with odema after surgery and radio therapy. This has loosened up the tissue in my neck and reduced the swelling and seems to have improved my saliva production somewhat. I'm resigned to the fact that this is as good as it gets now and I have to live with it and get used to it. It is a minor problem which is easy to get round and as long as you keep your mouth moist and your teeth clean, you will get used to it.
Also I use a high flouride touthpaste and mouthwash which has reduced my visits to the dentist.