Followed a link to SCM's blog and ordered her e-book on lotion making. $29 and the money goes to help Canadian kids. Money well-spent IMO. So, being extremely right-brained which doesn't embrace chemistry, this book explains things so that even I can, for the most part, understand it. I'm printing out different sections to study. All the recipes use distilled water and the steps don't change. She gives fantastic explanations of different ingredients. Her section on preservatives is great. BTW, grapefruit seed extract is NOT a preservative. My goal is to make a beautiful lotion. Her blog is going to become one of my everyday visits. I'm sure I'm late to the party on this one, but better late than never.