Using this M - PETS glass drinking bottle is a breeze. First, attach it to your pet's cage with the retractable spring cable. Make sure it's securely fastened so it doesn't fall. When filling the bottle, just pour water in through the opening. You can easily see how much water is left thanks to the water level indicator. Keep in mind that although it's chew - proof, try to prevent your pet from excessive chewing. To maintain it, clean the bottle regularly with mild soap and water to keep it hygienic. Also, check the spring cable from time to time to ensure it's working properly.