Okay guys, here's an UPDATE:
I used 5 gallons store-bought juice, 2 lbs destrose, and Safale -- either 04 or 05, I forget.
OG: 1.068
after 10 days it's fermented down to 1.007. It's tasty! but could stand to be drier.
My question here is, how far down will it continue to ferment, and if not...