Hey - cool advice Pam and Horsefeathers - thank you!
I will visit our bulk canning supply depo this weekend to check this out.
My snap jar with cling wrap is still going well, but I would not mind going back to the canning jar as it has more volume with a bigger aperture.
To get back to Bruce's question and concern - I believe no pressure problems will be experienced should the dosage per batch made be kept below the 1 Lt and 3000ppm level for the shot glass method.
I will try a batch of 10 000+ppm in my canning jar this weekend just to check this out.
@Bruce - we should do a survey sometime to check the ratio of people using CDS and their preference methods of manufacture.