Before you get in the shower, combine three tablespoons of flat beer in 1/2 cup water. Once you shampoo your hair, massage the beer mixture into the hair. Let it set for two to three minutes and then rinse. Another recipe calls for one cup of beer and one teaspoon of jojoba oil. Mix together and then apply to the hair, working your way from the scalp down to the ends. Let it set for a few minutes. Rinse well. For a different technique, fill a spray bottle with beer and begin spritzing the hair after you've washed it. It's important to remember that beer should be room temperature. So you may want to crack the can a day prior to your beer bath. Practice moderation as the effects of the beer should last several weeks.