Like Eric, I found the Biotene spray to be helpful, but rather pricey for the amount that I used. A poster on OCF shared a more economical way: buy one of those empty mini-spray bottles (Rite-aid had them 3 for a dollar) and fill it up with biotene mouthwash. the effect was pretty much the same for me and since I use the Biotene mouthwash anyway, no real additional expense.
Charm