Custom - Scented Bath Crystals

Rock salt or sea salt (you can also use water softener salt for this; it is much cheaper than sea salt)
Essential oils
1/2 quart glass or clear plastic jar with tight-fitting lid

Add approximately 4 teaspoons of the essential oil to the rock salt in a 1/2 quart container. If container is larger or smaller, add or subtract oil as needed. Cap the lid tightly and wait at least two days before using.