Bring water and salt to a boil. Stir in the baby pearl tapioca and return to a boil. Put the lid on and remove from the heat. Allow to sit, covered, for an hour. Then stir in the gelatin and the sugar and stir very well to completely dissolve. Then refrigerate until completely cool. Stir again and fold in the thawed whipped topping and any fruit you wish to add, if desired. Refrigerate until ready to serve and stir again before serving.