5th of Everclear
will do if it is over 70% alcohol
1/4 ounce of dried, crumbled wormwood (available at most occult-ish places)
Add both these together and shake once daily for 3 days. Store in a cool and DARK place.
On the 3rd day strain the wormwood from the alcohol.
Add the following things (available at most markets in the spice section):
Let all this sit in the strained alcohol for 1 week, shake everday. Store in dark place because the sun will evaporate the alcohol.
After the week is over make 1 1/2 cups sugar syrup using sugar and water. (a semi-thick mix)
Add to alcohol and you have Absinthe