Choose to make either the Fall and Winter Digestive Bitters or the Spring and Summer Digestive Bitters.
Add the ingredients to a pint-size jar and fill the jar with vodka, leaving a one-inch headspace from the rim of the jar.
Put a tight-fitting lid on the jar and shake it a few times.
Place the jar in a cool, dark place, such as in a pantry.
Shake the jar every day.
Continue to do this for 2 to 4 weeks.
After this time, strain the solids from the liquid. Use a fine mesh strainer placed over a large measuring cup to do this. (See video.)
The strained liquid is the digestive bitters.
Decant the digestive bitters into an amber-colored bottled with a tight-fitting lid.
Store the digestive bitters in the pantry or in the refrigerator. They will stay at peak potency for at least one year.
To take digestive bitters, put 1/4 teaspoon on a spoon and place it on to your tongue or mix a 1/4 teaspoon with a small amount of room temperature water and drink it. Do this before eating as well as after consuming a heavy meal if indigestion occurs.