Take one of the 1 liter plastic bottles and wrap with pink duct tape (this will be the body).
Using scissors cut the top part of the other four bottles to use as feet for the piggy.
Using duct tape, tape the four feet to the bottle that is already wrapped.
Using scissors cut two of the bottom pieces off of one of the unused bottles (these will be the ears).
Cover the two plastic bottom pieces (the ears) with duct tape, and glue to the body using hot-glue gun. *Parental assistance is needed. (Or ears can be taped on body with duct tape).
With glue, attach two googly eyes to the face of piggy.
With scissors, cut a slit in the top of the piggy body to insert money.