Prior to going, eat an apple or two. The fiber and pectin in the apple will help adsorb and bind the alcohol and time release it more evenly.

For each variety of wine you taste, take only a small sip. This will allow you to aerate it better and allow for flavors to develop on your tongue.

Drinking water between tastings is another good trick, both because it helps keep you hydrated and because it will cleanse your palate between tastings.

Make sure you don't have to be anywhere immediately after the tasting. Try to plan a meal after the tasting at the tasting venue, if possible, and give your body time to metabolize the alcohol.

Staying hydrated is key. If you can drink a glass of water for every half glass of wine, chances are you will not be as affected by the alcohol.

Finally, if there is ANY doubt in your mind about your sobriety, don't drive. Call a friend, call a cab, or, if possible, book a hotel room close enough that you can walk there.