This can be used to refill 100ml bottles. In addition to using directly on the skin rosemary hydrosol is great for the bath, where essential oils are not water soluable and sit on the surface of the water, hydrosol contains the aromtics within a water structure making it easier for your skin to absorb. Hydrosol is also a good cleaner and can be added to washing, used as a room freshener, and general cleaning applications.