Essential Oils Perfume-atomizer One method is to simply add about 1 part of fragrance or essential oil to 10 parts of water. The fragrance will not dissolve completely because oil and water do not mix. But, when you shake the oil and water mixture it will turn into a milky mixture. You can also mix the fragrance and water directly in the perfume atomizer bottle. shake the bottle before using each time . The second method is for fragrances that are thick and may not mix at all with water.