Heart Failure Support Group
Heart failure is a condition that can result from any structural or functional cardiac disorder that impairs the ability of the heart to fill with or pump a sufficient amount of blood throughout the body. It is often undiagnosed due to a lack of a universally agreed definition and difficulties in diagnosis, particularly when the condition is considered "mild."

I believe that there are other alcohol-free mouthwashes/toothpastes on the market so you may want to research that and do some price comparisons between them and Biotene. In general though, the alcohol-free washes do tend to be more expensive though.
My opinion is that if the dry mouth is seriously bothering you, then it is definitely worth the cost to use Biotene or a similar product.
I use it because some of my meds cause dry mouth.
HUGZ,
Jean
For your cpap, you might also add a chin strap to cut down on the mouth breathing during the night.
Hugs