I'd like to make soap (kinda obvious, eh?) But I don't want to make it with lye for reasons. I've been looking at melt and pour soaps, but some site said they weren't that great. That they only last for a week or two, and they start to "sweat" or melt after they get wet, or even if they don't. Is there a certain way to make it so it doesn't do that? Some way that will make it last for several months at least?