A guinea pig requires constant access to water and this is best provided by using a water bottle attached the side of the hutch or cage attached at a height that the guinea pig can comfortably reach.

Water bottles with ball-bearings in the tube tend to be less prone to leaking than those without. In any case it is best to provide two water bottles as a precaution, then should one water bottle leak and empty the guinea pig will still have access to water from the second water bottle.

If the guinea pig is kept outside it is important to ensure the water does not freeze during the winter months and therefore it may be necessary to insulate the water bottle by wrapping some padding or thick cloth around it and checking daily to ensure that the water has not frozen. It should also be noted that a completely full water bottle may crack if the water inside becomes frozen as the water expands so the water bottle should be filled to 2-3cm from the top and never completely to the top.