Plastic bottles are made with a variety of resins, the most popular of which is high-density polyethylene (HDPE), Low-density polyethylene (LDPE) and polyethylene terephthalate (PET) are also popular resins used to make different types of plastic bottles. PET is most often used to make plastic bottles for water and soft drinks, and the above video will demonstrate the manufacturing process.
The plastic that eventually becomes a bottle starts out as a malleable resin, which can be manipulated into different shapes by blow molding. The resin is attached to a mold, which is blown into shape with hot air then left to cool. As soon as the mold cools, the bottle is ready to use.