So I took all the bones & feet from the pig I butchered. Roasted, then simmered them for 6 hrs. Stained and refrigerated. Skimmed off the inch of fat. Simmered for another couple of hours and back to the fridge. This started as 4 gallons of water. Reduced to 3 quarts. Bagged in 1/2 cup servings and setting in the freezer for what ever I want.