A water bottle assembly for use with an endoscope, the water bottle assembly comprising: a water bottle having a neck portion with threads on the exterior surface thereof; and a water bottle cap having walls and threads formed on the interior surface thereof; wherein the water bottle assembly further comprises: an adapter comprising: a substantially tubular body having an interior surface and an exterior surface and having an upper body portion and a flared lower body portion ; the upper body portion having threads on the exterior surface thereof and being removably affixable via the threads to the water bottle cap ; the flared lower body portion having threads on the interior surface thereof and being removably affixable via the threads to the neck portion of the water bottle ; the adaptor further comprising a gas inlet port extending outward from the exterior surface of the tubular body and having a central passage extending through the tubular body and opening on the interior surface of the tubular body ; and one or more tubes affixed to one or more openings formed in the water bottle cap , at least one tube extending through the water bottle cap , through an interior passage in the adaptor , and into the water bottle . a water bottle having a neck portion with threads on the exterior surface thereof; and a water bottle cap having walls and threads formed on the interior surface thereof; wherein the water bottle assembly further comprises: an adapter comprising: a substantially tubular body having an interior surface and an exterior surface and having an upper body portion and a flared lower body portion ; the upper body portion having threads on the exterior surface thereof and being removably affixable via the threads to the water bottle cap ; the flared lower body portion having threads on the interior surface thereof and being removably affixable via the threads to the neck portion of the water bottle ; the adaptor further comprising a gas inlet port extending outward from the exterior surface of the tubular body and having a central passage extending through the tubular body and opening on the interior surface of the tubular body ; and one or more tubes affixed to one or more openings formed in the water bottle cap , at least one tube extending through the water bottle cap , through an interior passage in the adaptor , and into the water bottle . an adapter comprising: a substantially tubular body having an interior surface and an exterior surface and having an upper body portion and a flared lower body portion ; the upper body portion having threads on the exterior surface thereof and being removably affixable via the threads to the water bottle cap ; the flared lower body portion having threads on the interior surface thereof and being removably affixable via the threads to the neck portion of the water bottle ; the adaptor further comprising a gas inlet port extending outward from the exterior surface of the tubular body and having a central passage extending through the tubular body and opening on the interior surface of the tubular body ; and one or more tubes affixed to one or more openings formed in the water bottle cap , at least one tube extending through the water bottle cap , through an interior passage in the adaptor , and into the water bottle . <EOS>