Firefly Refill Bottle for Refillable Liquid Candles USE: Easily and Quickly Refill Your Firefly Liquid Candles. This bottle is EMPTY. TIP: Unscrew the top slightly when storing to eleviate the pressure and be sure to store on a paper towel in case there is a drip. TIP: If You Prefer a Greater Flow of Fuel, You Can Cut the Tube Back CAPACITY: This EMPTY bottle will hold approximately 16 oz. and will refill a dozen or more oil candles IMPORTANT:Careful not to overfill as it will siphon the fuel physics is physics. We suggest always filling your candles over a paper towel because there may be a drip or two and fuel can act as a solvent on wood and painted surfaces. If there is a little bit of fuel left in the spout,, simply, unscrew the cap. This will release the pressure and the fuel will return to the bottle from the tip. Store on a plastic lid or a paper towel. That's how we do it.