Okay, sorry for chiming in so late. I've been "out of commision" lately.
As I gathered, you have roughly 5 gallons of grapes, correct?
As others have said, freeze them in ziplock bags or something that is food-grade. Garbage bags, I have read, are not food-grade, but if the grapes weren't in there for a week, they should be okay.
So, what you do: Have the grapes in the freezer for at least a week. That is enough time to get your supplies to make some awesome wine.
The key will be once they've defrosted to know how much juice you have. I'll assume 3 or so, but I'm not sure.
Now, others might disagree, and I encourage people to let me know if they do. This is what I would do:
1. Freeze the grapes.
2. Get a food-grade, 5-gallon container - try at your supermarket bakery for one.
3. Get3 frozen White grape concentrate from your freezer section. (I will explain why later)
4. Get either3 1-gallon jugs (like the kind you get when you buy wine in a gallon) or 1 3-gallon jug (called a carboy. Costs about 20 bucks).
5. Get3 (or 1) air-locks. These allow CO2 out of your wine while it ferments.
6. You need only a few other supplies at the beginning: sulfite/campden tablets, nutrient, sugar, hydrometer and yeast. Just guestimating the expense of these: 20 dollars. The most important supplies are campden tablets, hydrometer and yeast. (WINE yeast, that is)
7. You will need a racking tube later, but in the first week that the grapes are freezing, you can get all the supplies you will need.
8. A warm place to keep your wine. Ideal temps are about 73ish. They ideally shouldn't fluctuate, but yeast can work from about 68-80 degrees. The higher the temp, the faster the fermentation. Not always a good thing, but I think it's not a problem for your first batch. The best bet is to keep your wine in the kitchen or even the bathroom.
Now for the nitty-gritty:
A lot of you might say "why grape concentrate", but I have made concord wine (which your grapes are presumably) out of JUST concord grapes. Very good, but it's lacked in complexity. If you add some niagara grapes, you might have a better wine. 1 can of concentrate per gallon is optimal.
The supplies I listed are the minimal ones you need to get. I'll write more later.
I've been having some problems with the computer as of late. Hope I'm not too late in responding.
Edited by: MedPretzel