Step 1: Pour the bottle of whiskey into a sealable jar (or pour out a little bit of whiskey to make up for the added volume of the weed) and add the ground weed.
Step 2: Shake the bottle and let it sit, out of the sun, for at least 48 hours. Shake it up at least once a day until it has reached your desired potency - up to one month if possible. The longer it sits, the more potent it will be.
Step 3: Pour the whiskey mixture into a glass container, using a cheesecloth to strain out all ground weed from the whiskey. Repeat this step as necessary to strain all of the whiskey from the ground weed, and discard the remaining weed.