This idea for cheap homemade camping mugs means that if one goes missing, it is no big deal.
A temporary cup can be made of a tomato or baking-powder can. Just make sure that the rim is smooth and doesn't have any jagged edges where you might cut your lip.
Punch two holes near the top of the can. Now bend a piece of wire and place the ends through the holes as shown at A in the sketch.
Pull the ends to draw the loop close up on the inside of the tin and then twist the ends to form a handle as shown at B.
When there is enough wire twisted to form a good handle, pass the ends around the can at the bottom and twist them together on the opposite side.
Sharing is a way of saying, "Thanks!"