I searched around nc.com and couldn't find anything about how to do this. It's pretty easy and you can search on google & get a bunch of how-to hits. They're generally how to make your leftover soap slivers into liquid.
I did it to make my "poo" just a little easier and quicker.
Need: blender, soap bar, hot water
1. Chop your soap bar up, about an inch or smaller pieces. Place in blender
2. Pour about 1/2 cup of hot water into blender. Put on lid and turn it on. Keep adding the hot water until it's the consistency you want.
It took more water than I expected it would, which I didn't measure. I will next time though.
Southern Colorado Curly Mix of 2s med-low porosity, med-fine texture, lots of hair