Almost forgot. You'll need a "proof vial". That's a small glass vial that you check the proof of the whiskey. Close to 200 proof wil have a bead (bubble) half in liquid, half on the side of the vial that holds for a few seconds until disappearing.

Catch about half a vial full, hold your thumb over the mouth of the vial and whack the bottom against your other hand a few times. Look at the bead. When it no longer holds a bead, the proof is dropping. Time to empty the still and begin the next barrel of beer. If you're running singles, keep collecting it if it holds any bead at all.

Cut the final product, which is very nearly 200 proof alcohol, with clean water until it just holds a bead after three to four solid thumps on your palm in the proof vial. Not cut enough it is hardly drinkeable, cut too much it can bubble up and spill when it's shaken in transport. The bead turns to many small bubbles, not just one large one.