I made this fire pit at home after camping in Maine. Super easy. You will need a fire ring, or if you can find one, a tractor trailer rim works too. Dig a hole approximately 4" deep, and the diameter of the ring. Place ring in hole, and back fill with the dirt removed from the hole. . I got all the slate and other rocks on my property, so no cost there. Surround the pit, as shown, and because the ring has no bottom, it will drain naturally into the ground when it rains.