NOT a hard and fast formula, because your available ingredients may vary from mine. For example, I list “melaleuca alternifolia oil,” but what I use is 100% melaleuca oil refined to T36C5, meaning 36% terpinen-4-ol (the active anti-bacterial, anti-fungal, anti-viral portion of the oil), 5% cineole (the penetrating fraction of melaleuca oil). The “aloe vera gel” I use is also just what is available to me.
In a one ounce bottle:
25 drops of melaleuca oil + aloe vera gel to the 1/4 bottle mark
Everclear™ (95% ethanol).
Shake well before each use.
The resultant mixture should exceed 70% alcohol (CDC, et al recommend 60% alcohol in hand sanitizer that uses alcohol), plus the antiseptic properties of melaleuca oil and the skin conditioning of the aloe vera lotion. Then, of course, there is the pleasant (to me, at least) aroma of the melaleuca oil.