We use this soap as hand wash in both the bathroom and kitchen at our place and it is very cheap to make. The first time I made it it ended up very goopy and stringy and it would not break off from the bottle after you pumped it so there was long strands of soap being stretched between your hand and the pump bottle. I think it was because I added too much glycerine. I have since adjusted the recipe and I am much happier with the result.
The glycerine can usually be found in the supermarket near the medicinal things, in my local it is next to the Tea Tree Oil. You can also sometimes find it near the cake decorating items as it is used to make royal icing pliable. I am not sure it there is any difference but the one I use says "can be used and an emollient to soften roughened skin, chapped hands or sore lips".
I make this in 1 litre amounts because there is only the 2 of us, and even then it lasts for ages. You will need a stick blender, food processor or some other method of breaking the mix into a liquid.
1/2 cup of Lux or grated soap flakes
1 tsp Glycerine
1 litre of water
Into a saucepan place soap flakes and glycerine. Add your water and heat on the stove on a low - medium heat. Stir occasionally until all the soap has dissolved.
It will cool and solidify into a thick jelly like substance that now need to be blended to form the liquid soap.