In a large bowl, dissolve gelatin in boiling water. Stir in soda and lemon juice. Cover and refrigerate for 2 hours or until set.
Add whipped topping; beat on high speed for 4-5 minutes or until smooth. Stir in food coloring if desired. Place 3/4 cup mixture in each of eight dessert dishes. Refrigerate until set. Just before serving, top with berries and kiwi.