Mix all dry ingredients EXCEPT citric acid in a large mixing bowl (salt, baking soda, cornstarch).
In a separate small bowl, mix water, essential oil, apricot oil and food coloring.
Combine the wet and dry mixture, which should resemble the texture of dry/moist sand. Almost like a flour consistency.
Mix until the color is even. It takes awhile and it's not just stirring, but rather pushing down with a spatula on the chunks of wet. Adding the food coloring helps you figure out if it’s well-mixed. An even color means a good mix. When you squeeze some in your fist, it should hold together.
Add citric acid and mix again (do NOT use your hands at this point as the pure citric acid is abrasivand do not add water after you mix in the citric acid.
Add in your desired decorations and mix with a spoon.
Pack tightly into the mold and wait 24 hours for it to set, then remove. You can try to remove them earlier, but if it starts to crumble, let it dry longer.