I don't water wash at all so I can't help you with the water. I use the GL1 process
GL's Eco-System state diagram
The soap/glycerin at this point I am stock piling. I add the previous batch Glycerin into the next batch while heating and circulating to remove the methanol and any trapped oil. I am looking into some Soap (bar and liquid) making but I can't use or sell that much soap so I am looking at the viability of using to suppress dust in our gravel parking lot and also using it in a waste oil burner. Neither of which I am sure yet will be good options.

There is not really any need for a book. I did buy Girl Marks book and but I learned and continue to learn on this site
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