coffee is like life, it doesnt have to be complicated.
there is no substitute for real coffee. Keep It Simple Silly.....
i use a plastic cup, 6" x 3". doesn't burn my lips nor will it break when i drop it.
maybe half an inch of grind in the bottom, pour boiling water into it. grinds float on the surface, after a few minutes, lightly agitate the cup (no need to stir), and now the grinds will naturally sink to the bottom. for me its still way to hot to drink, by the time i can, all the grinds have sunk to the bottom and you have a perfect cup of coffee.
how hard was that?
no messy filter, bury the grinds next to bush for some fertilizer, and bobs your uncle