For your last question , on average I fill the paper filter one half full of coffee grounds for 8 cups, plus or minus.
If I do 12 cups, for guests, I fill it to a point ,I have learned will not over flow the edges getting grounds into the coffee; when done that wet filter is full very close to the top.
It is a Mr.Coffee basic 12 cup drip coffee maker.
I grew up with Postum, it was out of production for a few years, and I got into the Ebay buying from gents who were smart enough to buy cases when it was publicized production was starting.
Back then I got six jars for , if I remember correctly, 6 bucks each for 8 oz. jars. People were paying twice that by the time the supply was near gone.
Kraft is the one who dropped it but now Eliza's Quest Foods in Charlotte,SC has resumed production, BUT, (I have an old and new jar) while both say 8oz., the new jar is 3/4s as big as the old one
and now costs a lot more .
Postum now comes in coffee and cocoa flavors and I think the original also came in coffee flavor.
Maltodextrin (from corn)-- basically a powdered corn syrup with far, far less sugar.
They taste alike to the point you would have to do the coffee test sip and spit to know a difference.
I forget what I paid a few years back for my new supply but the cheapest I find online is 14 bucks a jar (I wonder what they cost in SC?)
As I said I grew up with it and like it but when it was gone I tried Cafix, which was hyped as a fix for Postum addicts, ;
Pero, I have tried also is similar to Cafix -- it/they, were OK but compared to what Postum used to cost in stores 2.79 for last jar I bought in store, still expensive.
Cafix---- Barley, malted barley, chicory, rye
Pero---- Roasted Barley, Rye, Chicory, Sugar Beets.