On Aug 5, 11:02*am, rabbits77 > wrote:
> I'd like to try making wine this year.
> I have a source of Concord grapes. This is the typical
> somewhat tart grape common in new england.
> Given that it is not very sweet naturally will it be necessary
> to add a second grape variety? Or maybe just a sugar?
> Anyone here use these grapes before? How many grapes/volume wine?

Go with Jack Keller for starters
http://winemaking.jackkeller.net/reques10.asp

Unless your grapes are very acidic, adding a lot of water is not
necessary. Concord is best finished sweet. Sweetening will cut down
on Jack's recommended aging time.
Jack's recipes are for ~1 gallon.