To make a floating candle you will need a screw, a candle, and a glass of water. If you take the candle and just put it down in the glass of water the candle will not float. To make the candle float take the screw and screw it into the bottom of the candle. Then you can take the candle and put it down in the glass of water. With the screw screwed into the candle the candle will stand upright in the glass of water and the wick will float just above the water line. So now you can light the candle and have your floating candle.