Most oil is lighter than water, so it floats on the water. If there is little water mixed in them, you can pour the oil into the pot and heat it, and it is best to keep the oil temperature at 100 degrees, then the water will evaporate first, so there will be no more water in the oil. If there is a lot of water under the oil, you can also suck out most of the water with a straw or pour most of the oil into other containers and then suck out most of the water. When there is only a small amount of oil-water mixture, pour it into the pot and heat it according to the above method.