instructions: fill the bottle and replace the screw cap FIRMLY. shake the bottle to ensure that water is at the end of the spout. a small amount of water must drip out until a vacoom develops inside the bottle. dripping is reduced by starting with a full bottle. changes in room temperature can cause occasional dripping (air expands in the bottle as temperature rises). bend the hooked wire provided around the bottle to form a loop. the bottle can then be fixed to almost any kind of cage.