Lemon-Blueberry Pie Cups

6 vanilla wafers
1 cup of boiling water
3/4 cup of cold water
3/4 cup blueberry pie filling
1 package (4 serving size) Lemon jello
1 tub 8 oz. Cool Whip

Place 1 vanilla wafer in the bottom of 6 dessert cups.  Top each wafer with 2 Tb. of pie filling.  In a separate bowl mix boiling water with jello.  Stir until dissolved.  Stir in cold water.  Refrigerate for 15 minutes until mixture is slightly thickened.  Stir in 1/2 of the Cool Whip until well blended.  Spoon over the pie filling in the cups.  Refrigerate for 2 hours until firm.  Top with Cool Whip and 3 blueberries, if desired.