I do not believe there is glycerine in any of the items you mentioned.
You will require sodium monophosphate. There are a number of companies who manufacture it. I believe the Swanson price is the cheapest. You need about a gram a day in some water. I do not know of another source, but perhaps there is one.
For $8, you don’t have much to lose.
Thanks, I’ll try it and maybe go back to baking powder.