There are a number of hydration devices that have been sold for regulators over the years. The problem if they spray into the regulator is the possibility of freeze-up if you are in water less than 45 Degrees F. You can just let a little water into your mouth to moisten your gums, but you need to be confident that the surrounding water is safe for consumption. And if it's salt water, never swallow.
Any solution that works for you is fine. Me, I just ignore it. I usually have much more to be thinking about than to worry about my dry mouth.
Any solution that works for you is fine. Me, I just ignore it. I usually have much more to be thinking about than to worry about my dry mouth.