I use the Biotene products as well as the baking soda/salt solutions. Both work for me for different symptoms.

The baking soda is good for getting the mucus out of my mouth. I use the Biotene gel at night to keep my mouth moist while sleeping.

I did find a product by Sensodyne called Oasis. It's a glycerin based spray that works for dry mouth. It's small enough to carry in a pocket.

As to the upset stomach have you tried good old Milk Of Magnesia?