all you need is:
2 bars of soap and a grater
vegetable glycerin
water
to start, you grate the bars of soap (which is actually very quick and easy).
then you put the grated soap into a pot and add 2 tbsp. of vegetable glycerin. (this amount may change depending on the bar of soap you use. i started with 1 tbsp, and it just wasn't enough).
next you add 10 cups of water.
and heat on the stove until the soap is completely dissolved.
then you let the soap completely cool, and it will be ready to use! i poured it through a funnel into my soap dispenser and am storing the rest under the sink for future use.