Run the empty case through the sizing die and decap the spent primer. Put a bullet into the throat of the case and seat it as you would a live round. Put a fairly tight crimp on the bullet. Clean off the case so its free of dirt and oils and spray paint it a bright color. Red, orange, yellow, whatever you have laying around the house even. Next break the eraser off the end of a pencil. Trim it with a knife or razor blade to fit into the primer pocket so it is just recessed below the surface of the head. Mix some two part epoxy and glue the eraser into the primer pocket. Put a good amount of epoxy into the primer pocket and press the eraser in until it is flush with the cartridge head. You want some of the epoxy to push through the flash hole to secure it better.
Bring a GPS...its awkward when you have to eat your buddies