Abstract: Disclosed are embodiments of a humidifier bottle apparatus. One embodiment of the apparatus includes a main housing, a fill shaft extending at an angle from the main housing, and a substantially dome-shaped main housing cap, which is releasably connected with the main housing. Gas inlet and gas outlet ports are also connected with the main housing cap. A purge valve feature may be included with some embodiments of the humidifier bottle apparatus. The purge valve feature may provide for audible and/or visual warnings of pressure increases within the apparatus.