Guinea pig water bottles usually come with a wire clip for easy attachment. Or, they can be used with an adjustable wire bottle cage or guinea pig water bottle stand.If you place the bottle on the outside of the cage, the spout sticks through the cage bars. This allows your piggies to get a drink whenever they want one. This can be an option if the bars are too closely spaced to allow the bottle’s drinking nozzle to fit through comfortably. Its essential that your guinea pigs have access to clean, fresh water 24/7. If you’re out at work all day, providing your piggies with a large guinea pig water bottle means you won’t need to worry that they might be thirsty while you’re not there.