Measure the isopropyl myristate into a mixing container. Add the Bramble Berry's Black Opium Type Fragrance Oil

Thoroughly stir the fragrance oil and isopropyl myristate together until fully combined.

Carefully pour the mixture into the perfume bottles. I recommend using a small funnel for this step, or using a dropper to fill the bottles, as the opening for the bottles is quite small. Place the spray top on each bottle, and firmly twist to secure. Place a label on each bottle, enjoy!