The most popular way to collect the essential oil is through steam distillation. Steam is used to help release droplets of oil. Together the droplets of condensed water and oil collect in a container where the oil floats to the surface (the water part is called hydrosol or floral water). Cold pressing is another method, commonly used for extracting citrus oils. The rinds are ground or chopped and then pressed to release a watery mixture of essential oil and liquid. Eventually, the oil separates and is ready to be bottled. Essential oils are concentrated so be cautious.