About 1960 maybe even earlier, institute offers classes in coffee brewing. After the training, we were awarded a cup of golden brown 01/02 and hung at the entrance of the bar. Tap water should be safe to drink. Never boil or encouraged. 210 degrees. No more. Freshly brewed coffee in a can or bag near unattainable unless you find fresh roast and ground ‘em yourself. To test, take some coffee and roll between your thumb and forefinger. You should feel the oil. Second test, place a cup of hot coffee on the table and you can see a thin film of oil on the surface.