I was going to try and make a toner for normal/combination skin and was wondering if there are any specific rules or recommendations to follow. Can the same preservative system be used as you use in lotions? I would like to incorporate some aloe vera juice because I have a bunch of it that I would like to use for something. also what eo's are recommended. Can peppermint be used for a cooling effect or would it burn? Can someone steer me in the right direction?