Welcome!
I usually don't make grape juice wines (not readily available here) but I do have a little experience with the process.
As far as yeast is concerned, I would recommend using Campden tablets (one crushed tablet per gallon, crushed and dissolved in 1/4 cup water) and add that to the juice. The next day, add the yeast. Yes, there is natural yeast in the grape juice, but there is also all kinds of other stuff like mold spores, lactic acid bacteria, etc floating around on/in the juice. That can ruin your wine. If you grow your own grapes, and press your own, you may be familiar with your particular strain of wild yeast, but in this case it would be a crapshoot.
Your BB is big enough, but you can also do the primary in a 7 gallon bucket. That might be easiest to start, since you need to stir it at the beginning, and it needs some oxygen. Once the SG gets down to the 1.020 area, it can be racked to your carboy and airlocked. It will need to be racked several times, whenever the lees are 1/4 inch think or at least every 30-45 days at first probably. You will probably want to add campden tablets (again one per gallon) at every other racking to help preserve the wine and prevent aeration. (so2 binds to the wine so that oxygen can't, and then it disapates over time, so it must be re-added).
You will want to purchase a hydrometer, to know where your SG starts and where it ends. I doubt that you'll need anything else, and won't need to add anything. I'm assuming that the acid adjustments have all been made when you purchase the juice.
It's not the same as a kit, exactly. The kits have juice "concentrate" so they don't taste quite the same. Your fresh juice wine will take longer than a kit, which are made to be drunk early. If you rack when needed, you can probably be ready to bulk age in 9 months or so. But you really can't follow a set timetable because each fermentation is different. After it bulk ages for about a year or so, you can be about ready to bottle.
Let us know if you have more questions, and again, welcome to HBT!
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Broken Leg Brewery
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