Pour the alcohol into a medium bowl (preferably one with a pouring spout). 

Measure and pour in the aloe vera gel. 

Add in the essential oil. Tea tree oil is naturally antibacterial. But if you’re not a fan of its smell, you can use another type of essential oil, like lavender, lemongrass, or eucalyptus. 

Whisk together until fully combined. You will want to be sure you have whisked it really well.

Pour the mixture into your bottles and label them so they don't accidentally get used ingested.