1Heat oven to 350°F (325°F for dark or nonstick pan). Grease or lightly spray bottom only of 13x9-inch pan. Add enough water to drink mix to measure 1 1/4 cups.
2In large bowl, beat cake mix, drink mix, oil and egg whites with electric mixer on low speed 2 minutes. Pour into pan. Bake and cool and directed on box for 13x9-inch pan.
3Gently stir lime peel into whipped topping; spread over top of cake. Garnish with strawberries. Store covered in refrigerator.