Xylitol can help make the voice feel less dry! Found in such chewing gums as Trident, it might make an interesting addition to your vocal kit.
However, I don't recommend singing AND chewing gum at the same time. It's hard to sing when you're choking from inhaling that wad! Just try chewing before performance (that's gum, not tobacco) and let me know what it does for you. Funny thing, I've been keeping gum with me for years out of courtesy to my session singing friends, and have been reaping some good side effects.