Hi, I'm making an aftershave and was hoping to to make one that is very low in alcohol. I was planning to make it using a formulation very similar to the product below except using EO instead of FO. The manufacturer claims their product is only 5% alcohol and that the only source of alcohol is from the witch hazel. In which case it would seem it is 1/3 WH and 2/3 water. My question is whether this base is stable for EO or would I need a preservative. https://www.amazon.com/Ogallala-Bay-Rum-Regular-Old-time/dp/B003ZGI3RI Ingredients: Witch hazel, purified water, bay rum fragrance oil, and sandalwood fragrance oil Thank you!