I think we finally stumbled onto the best solution for us. We either hated the taste, or cleanup, or cost, or equipment bulk of virtually every method we tried. Screens to wash out, or special filters to buy, or power draws and storage of some methods just didn't work for us. Now we use the simplest minimalist way I think possible. We buy the flat coffee filters for Mister Coffee type machines that are available anywhere cheap. I put one heaping tablespoon (our tastes - YMMV) of ground coffee into a bag, then fold up the top. I can either staple the top which allows me to drop the coffee bag into my capped travel mug, or wrap it over the tines of a fork. The first method lets me simply shake the contents for a cup, and the later method lets me massage it with the fork, which gets stronger quicker. Clean up is simply tossing the bag. While not the strongest cup of coffee, we've found that using very hot water works well for a smooth, ground free, satisfying cup. No wasted water on clean up, no special appliance to carry, and it's always a single cup.