To increase the length of time a bar of soap can last, would involve buying a soap dish that has a drainage function. This refers to water running off the soap into the soap dish to stop the soap from being placed in a puddle of water. If your natural soap is situated in water around the sink, shower or bath area it will dissolve in the water because the soap does not contain synthetic ingredients.
Soap dishes, whether they are metal, plastic or wooden can be purchased at a homeware shop, pound shop or online via Amazon and eBay. Also soap dishes are very inexpensve.
Below you will see an example of a good soap dish for preserving organic soaps.