I have looked up some recipes and it appears to take a few days to make. The first day it takes hours or stirring. I have also looked up making liquid soap from shavings of some of my soap bars that don't have a strong enough scent or cut wierd and that got kinda thick after a few days. Both recipes have water, the first is of course with the potassium hydroxide and the second water used in rebatching. Do I need to use a preservative?
To make liquid soap you replace the lye with potash which is also known as potassium hydroxide. It saponifys the oils but never get to the point where they harden into a bar. You just need a SAP table for potassium hydroxide so you get the formula right.
If you are just using it for your self i make mine with 1 bar of soap add like a quart of water heat in pan to mixed add like one tablespoon of glycern to keep from clumping when mixed add to half a gallon of water i use for this for laundry soap to you can add borax and or washing powder to make it a high cleaning agent works great and cheap i use natural soap from http://www.soapnbath.com it is a good natural cleaner