It was similar in my time, coffee was rare and very valuable, much much more then tea because we traditionally drink coffee a lot. Because that it become great for bartering on black market.
We drink also substitutes like “coffee” made from barley mixture, it was bad for blood pressure.
Infested food, home made marmalade (from tomato juice) expensive sugar etc. Gone trough stuff like that. History is often great teacher.
That book must be good read.