Are you sure about 20 feet from water source? I tought it was 200...
My rule is 1-2 feet down, 200 feet away from the trail and water... I throw paper into the hole and burn it. Than throw dirt back in and cover with leafs. Also before I do what I have to I inspect bushes for poison ivy. And if the place is tick infested I give my self a good check when I get home.
Matt