The zero-waste dentist also has a very thorough article on replicating Dr. Bronner’s castile soap at home. Castile soap traditionally refers to soap made with only olive oil, so Dr. Bronner’s, which contains a large amount of coconut oil, doesn’t actually count. Apparently the coconut oil makes a big difference in texture, smell, and cleaning ability, too.
On the topic of Dr. Bronner’s, awhile ago I was reading an article reviewing the company and was super confused when the article said “she has a lot of nice scents.” Who the heck was this “she”? It turns out Dr. Bronner is a woman… :'(