100 micron nylon strainer bag or 'nut milk bag' ...you could use 70 micron, 120 micron, 150 micron depending on preference and the grind of the root powder.
I have prepared it in a coffee maker simply by putting water in the carafe and then a strainer bag with medium grind in it and kneading the bag in the water for 10 minutes. But that would be the only way I can think of to make it in a coffee maker. To make grog out of medium grind, the three most common ways are kneading in a bag in water, or using the AluBall (or an alubag or something like that), or blend 'n strain using a blender and a strainer or bag for straining out the makas. The first two are fine for all purposes, but blend n' strain is really only for krunk, IMO.