Combine the hot water and white willow bark in a small bowl. Let the mixture rest for 30 minutes. (I've let my mixture rest overnight before, too.)
Use a fine mesh strainer or cheesecloth to strain the white willow bark from the infused tea.
Add the glycerin and essential oil to a bottle with a lid (I use an amber glass bottle with a spray nozzle). Place the lid on the bottle and give it a good shake. Add the the apple cider vinegar and infused tea. Place the lid back on the bottle, and shake to combine the ingredients.
To Use:
After washing the face with a cleanser, apply a small amount of toner to a cotton pad/ball and wipe the face. I personally like to spray the toner on my face and let it rest before applying a moisturizer. Store the toner in a cool, dark place (like a medicine cabinet) in between uses. I use toner at night before bed, and simply wash my face with water in the morning (just a personal preference).