Liquid soap is often easier for children to use. Making my own liquid soap will make one bar of soap last about a month rather than a week for my family.
To make liquid soap, just grate and dissolve 13 oz. soap bar in 5 liters of hot water, add 2 tablespoons of salt (optional) and leave overnight before bottling and using. I find that adding salt helps keep the soap from being slimy.
A mild soap bar is recommended-- hopefully one that has the least amount of perfume and color and other additives. Making your own soap is best. Learn how here.
Photo credit: Dvortygirl