1 can fruit flavored diet soda
1/2 c. lemon juice
1/2 tsp. vanilla
10 pkg. Sweet-N-Low
5 env. unflavored gelatin

Mix half can of soda and all other ingredients in small mixing bowl. Boil remaining soda and add to first mixture, stirring until gelatin is dissolved. Pour into 9 x 13 inch baking dish and refrigerate until firm. Cut into squares.