We used to do this too. I love to make homemade grape jelly. My mother would also just can the juice in quart jars whe I was a kid. She would open a jar and pour the juice into a pitcher, add some water and sugar, and we would have the best grape juice in the world. Much better than Kool-Aid.
Where did you get your grapes? I've been wanting to make grape jelly again, but I can't find anyone in my area who has wild grapes. The heat and drought of the last couple of summers have prevented the grapes from making. But when I find some, I will definitely make my jelly!