Many years ago (40+)when I was a young married, we joined the shul in our neighborhood and I started to attend morning minyan. The shammos served coffee after minyan. It was the most vile liquid I had ever tasted.
I asked a friend what was going on. I was told that the shammos took the leftover coffee from the Sunday morning men’s club breakfast and reheated it and served it all week. (this was the same shammos who would dry his teabag in a shot glass and reuse it all week…old habits from days of deprivation during the war die slowly).
I left for work and asked the office manager for the number of the coffee service we used in our break room. I called and arranged for a coffee maker to be installed in the shul kitchen and ordered a case of coffee, filters, cups and stirrers to be delivered each month.
It’s more than 4 decades later and I still pay the bill with pleasure, and I enjoy every cup I have after minyan.