The Eastern forehand grip (shown) is well suited to drop shots. You could also use a Continental grip, but if you want to develop the ability to hit drop shots from farther back in your court, you'll probably find it easier to use a grip closer to your regular forehand grip, and Eastern is closer to the modern range of grips (Eastern through Western) than is Continental. Some players manage to hit drop shots with a Semi-Western grip, but very few use a full Western.
