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Avoid moving the candle around once you light it, or you risk spilling the hot oil. Never leave a burning candle unattended. All it takes is a few seconds to blow it out. The water will evaporate over time, even if you are not using the candle. Each time you use the candle, check the water and oil levels first. Make sure that the oil layer is at least 1 inch (2.5 cm) away from the decorations. If the oil is too close to them, add more water. If the oil level is too thin, then add more oil.
Handle the candle with care while it burns. Maintain the water and oil levels.