In a 16 oz. glass spray bottle, combine garlic (or extract) and essential oils. If using smashed garlic, allow it to sit for several hours before using the spray (overnight is even better).
If using garlic extract, do not use white vinegar. Simply fill the rest of the bottle up with water 3/4 of the way full. However, if using smashed garlic, add vinegar at this point.
Shake the bottle well before each spray. Store in a temperature controlled area, like a pantry or medicine cabinet. Dispose after six months.