When combining oils to be used in massage, have the proper supplies on hand. Dark bottles (brown, blue, etc.) in a 2oz size work very well,and can be obtained with relative ease.You can use only one essential oil or combine up to three of your choice to comprise the 12-15 drops and your very own blend of massage oil is ready.Store in a cool dark place with the lid tightly closed and they will last up to three months.