Article: First, gently pierce the bottle with a knife around 12 inches (2.55.1cm) from the bottom. Then, insert a pair of scissors into the slit you made and cut around the bottle in a straight line until the bottom comes off. Set the top of the bottle aside for now and recycle the bottom. This is the container you'll fill with water. You can also use another plastic bottle that's bigger than the first one. If you do, just cut off the neck of the bottle so the rim is the same width as the body. Cold or warm water is fine. You want to fill the container almost all the way up leave 12 inches (2.55.1cm) between the top of the water and the rim of the container.
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Cut the bottom off the empty plastic bottle. Find a bucket or plastic container that's slightly larger than the bottle. Fill the larger plastic container with water.