I'm a little more sophisticated, I have one of those "mug/pot" combo things that holds a regular cup (handle-less), an old MSR "mug mate" about a quarter lb of fresh ground, some creamer and sugar packets, and my White Box alcohol stove and fuel. In five minutes I can brew up a fresh cup of coffee any strength, anywhere, anytime...Have always just stirred coffee into a pot of boiling water, let it steep a few minutes, then thump the pot on the ground, give it a minute to settle, and its coffee. Simple as can be.
although for big groups I still use your methods to make a gallon or more of coffee...