Gather all materials. (Four rubber bands, a air head box, a gatorade bottle, and you will need a hot glue gun)
Glue some of the side openings of the box with a hot glue gun.
Use this paper tube to make the hole at the top of the box so that the top of the gatorade bottle can get glued through it.
Glue the top of the gatorade bottle through the hole.
Rap two rubber bands around the box once and rap two more rubber bands around the box twice.
This is the final outcome of my homemade guitar.