How to make Navy coffee: Start with one of those 30 gal coffee pots that has been brewing for at least 36 hours. (Test by releasing a few ounces into a cup. If the coffee stays in the cup it's not ready to drink. If it escapes from the cup track it so the Marines can hunt it down.) Drink the coffee continuously, no tapering off toward the end of your watch. If the coffee is up to USN standards you'll still be chewing on it after a four hour watch. Go up to the mess decks and spit it back into the pot. DO NOT throw coffee overboard. It has been known to crawl onto shore and endanger children and small animals. ("Small" being anything smaller than an North American bison.) Repeat three/four times a day until you reach port. You will be ready to appreciate liberty by being entirely too awake for the first three days in port.
I miss Yuban instant coffee. Used to use it to make coffee candy. Seeing that Maxwell House ad raises a question, does anybody beside Costco have (tin) canned coffee grounds anymore? I know from "The Dude" flick (forgot the name of the flick) that Folgers comes in a plastic container and makes for a urn in a pinch.