Find a glass jar that you would like to use for the candle. Add water but leave about a centimeter of room for the oil. You can add decorations in the water if desired. Then add the oil on top, enough to completely cover the top. Cut a thin piece of plastic into a disk shape that fits into the jar. Poke a hole in the center of the disk and knot the wick near one end and put it into the hole in the disk. Put the wick and disk into the jar and stop once the disk is under the oil. The water candle is ready to be lit.