I'm also interested in hearing some answers! I love to sing and dry mouth makes that hard. Sometimes my throat/mouth get so dry (despite constantly drinking water) that my voice cracks or I can't talk!

Really strong mint gum helps for me a teeny bit, particularly before I sing. I like 5 gum because it has really strong flavor, but it could honestly be more long lasting. I've never tried them, but I know there are OTC saliva substitutes like biotene oral balance and I'd be interested to hear if anyone's tried them