A plastic water bottle is a portable container made primarily of plastic material and designed to hold and dispense drinking water. It is a common item used for carrying water, especially when people are on the go or don't have access to clean drinking water sources. Plastic water bottles come in various shapes, sizes, and designs, but they typically have a screw-on or flip-top lid for easy access to the water.

Plastic water bottles are often made from polyethylene terephthalate (PET), a lightweight and durable plastic. PET bottles are popular because they are affordable, convenient, and shatter-resistant compared to glass or metal alternatives. However, it's important to note that plastic bottles have significant environmental implications, especially when improperly disposed of or not recycled.