And, if you want to "charcoal polish" a vodka or 'shine, get about two feet of 1.5" pvc pipe and a hose clamp to fit it. Use the hose clamp to cap one end with four or five layers of basket type coffee filters. Fill the pipe with activated charcoal, the finer the better and suspend the pipe over a receptacle. If you are clever, you can use PVC bushings to bush up the 1.5" pipe to about 4" so you have large funnel at the top of the pipe. Fill the funnel and let it trickle though. It will take a good bit of time until it drips out the bottom. after you've run a few handles of 190 proof Everclear, run a pint of distilled water though the system and then dilute the Everclear or shine to drinking proof.
The whole rig should cost less than 20 buck and the charcoal is good for lots of runs if you dry it on a cookie sheet between uses.