To Make Soap nuts Liquid:
Boil approximately 12-15 whole soap nuts with 6 cups of water for 30 minutes. When it is boiled down, you will have about 4c. of liquid left. Add extra water, if needed, to keep it at that amount. When cooled, remove the soap nuts, and pour it into an airtight plastic or glass jar. It is better to make the liquid in smaller batches as it can spoil. Experiment with making liquid to see if you prefer a more concentrated version, using 3 cups water instead of 6 cups. Some prefer the concentrated solution for handwashing and shampoo.
To make liquid from soap nuts powder, add 1/4c powder to 6 cups of water and simmer for 30 minutes. Strain the sediment, or use as is. Store in an plastic or glass jar.