Amazon.com: Liquor Pourer Adapters 6 Pk - Adapt Any Liquor or Oil Pourer Spout into a Large Liquor Pourer - Fits Extra Large Bottles up to 1 Inch / 25mm Neck: Home & Kitchen
Water Bottle Bong Adapter – INHALCO
Green Portable Hookah Screw on Bottle Converter Water Glass Bong | eBay