Hard Way
Wash, crush and measure grapes.
Add 1 cup water to each gallon of crushed grapes.
Heat grapes and water 10 minutes at 190 degrees F.
Do not boil.
Strain juice in a damp jelly bag or several layers of cheesecloth.

Easy Way
Use a Steamer Juicer
Works for seeded or unseeded grapes.

Click to see a Steam Juicer

Then

Let stand for 24 hours in refrigerator (important)
Ladle juice from pan, being careful not to disturb sediment.
Strain juice again. Not needed for steamer juicer.
Measure juice; add 1-2 cups Sugar for each gallon to your taste.

To Freeze

Ladle into freezer containers.
We use gallon or 1/2 gallon plastic cartons.
Leave 1 inch headspace.
Seal, label, and freeze.

To Can

Reheat to 190 degrees F.
Ladle hot juice, into jars leaving 1/4-inch headspace.
Wipe rim, place lids and tighten rings.
Water Bath or Steam Can pints and quarts 15 minutes.
We use a steam canner.