FREEZE small mixer bowl and beaters. Pour 1/2 cup water into small bowl; sprinkle with gelatin.
COMBINE 1/4 cup sugar and flour in small saucepan. Add strawberry juice and gelatin mixture; mix well. Cook over low heat, stirring frequently, until sugar is dissolved. Remove from heat. Stir in strawberries and 2 tablespoons lemon juice. Pour into large mixer bowl. Refrigerate for 20 minutes or until thick and syrupy, but not set.
BEAT ice water and dry milk in chilled bowl for 3 to 4 minutes or until soft peaks form. Add remaining lemon juice and beat for 3 to 4 minutes or until stiff. Fold in 2 tablespoons sugar; blend on low speed. With wire whisk, mix whipped topping into strawberry mixture.
POUR into pie crust. Refrigerate for 2 hours or until firm.