Choose a fragrance style
Gather essential oils or fragrance oils
Get perfumer’s alcohol or high-proof ethanol
Use distilled water if needed
Use a glass mixing bottle
Add fragrance oils to the bottle
Add alcohol to the bottle
Shake gently to combine
Let the mixture age for several days to several weeks
Shake occasionally during aging
Filter the cologne if needed
Transfer to a spray bottle
Test on skin
Adjust the scent strength if needed
Store in a cool, dark place