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The bottles need to be the same shape and size. It would be best if they are the same color, but you can use different colors if you want to, such as clear and green. A small water bottle or soda bottle will work the best for this. You can also use a 2-liter (67-oz) bottle for a large coin purse. Wash the inside of each bottle half with soap and warm water. Rinse them, then dry them with a towel. Be sure to remove any labels or sticker residue.  Skip this step if you used water bottles. They won't be sticky like soda bottles. It is better to clean bottles after you cut them. The opening is larger, making it easier to reach inside.
Find 2 plastic bottles to use as a coin purse. Clean the inside of the bottle halves, if needed.