HOMDIS Portable Humidifier, Small Mini Humidifier with Auto Shut-Off, Nightlight and Storage Bag for Travel, Hotel, Bedroom or Office, Plant Humidifier Indoor, BPA-Free humidifier small humidifier mini humidifier plant humidifier travel humidifier portable humidifier baby humidifier humidifier for baby humidifiers for bedroom baby baby humidifiers for nursery air humidifiers for bedroom humidifiers for bedroom kids desk humidifier personal humidifier cool mist humidifier baby humidifiers for bedroom humidifiers for bedroom baby small humidifiers for bedroom portable humidifiers for travel humidifier for plants small humidifier for plants mini humidifier for plants plant humidifier indoor evaporative humidifier plant humidifier room humidifier bedroom humidifier cool mist humidifier baby Water Bottle Compatibility Guide This humidifier requires a rigid (hard) bottle. Soft bottles may compress under pressure and cause water leakage. Compatible with water bottle neck sizes: 25 mm (0.98 in) 26 mm (1.02 in) 28 mm (1.10 in) Examples of compatible water bottle brands (for reference only): Smartwater (16.9 oz / 500 ml) Evian (16.9 oz / 500 ml) FIJI (16.9 oz / 500 ml) San Pellegrino (16.9 oz / 500 ml) Waiakea (16.9 oz / 500 ml) blk. water (16.9 oz / 500 ml) You can also use standard soda bottles, as long as the bottle is firm and matches the size above.