Wash cranberries and any other fruit you may be using.
Combine cranberries, orange (or lemon) zest and cold water in a medium-sized pot.
Tie any spices you are using in a small cheesecloth pouch. If you don't have any cheesecloth, don't worry, just add the spices to the pot as they are.
Bring the contents of the pot to a gentle boil, and remove from heat about a minute after it comes to a boil, to preserve the vitamins. Let cool between 30 minutes to an hour.
Once cranberry concoction has cooled down, remove the cheesecloth pouch. Pour the juice through a tight-mesh colander into a one-liter jar, taking care to squeeze all the juice out of the berries and fruit with a wooden spoon.
Taste and sweeten with agave syrup, honey or sugar. Let stand overnight or for a few hours, for the flavors to mend and come together.
Serve cold, in room temperature, or heated gently in the microwave.