Use premium, clean cranberries from your garden or shop.
Start with 3 pounds of cranberries (adjust quantity for more concentrated juice).
Combine 4 quarts of water and cranberries in a large stockpot and simmer.
After 5 to 10 minutes, the cranberries will burst and release their scents and colors.
Strain the mixture using a jelly bag or two layers of cheesecloth to separate the liquid from the solids.
Repeat cooking and straining if there's more juice left in the cranberries.
Use a juicer or other instrument to extract the juice directly from the cranberries.
You might need more cranberries to produce the same juice as the whole cranberry approach.
The flavor of the extracted cranberry juice may differ from the simmered juice, which tends to be richer and stronger.
Once you have your cranberry juice, taste-adjust the sweetness to your preference.
Stir slowly to mix the sugar into the juice.