In a small bowl mix together the baking soda and citric acid. Then add in 1-2 tablespoons of the Dr Bronner Castile Liquid Soap. Mix together until the mixture is lightly moist and can be packed together.
Firmly press into your ice cube tray or small silicone mold. You can use any shape mold, but make sure the shape fits into your dishwasher soap dispenser.
Let the tablets dry in the mold for 2-3 days on the countertop. Then when fully dry store in an airtight container.