Pour evaporated milk in a mixing bowl; place in freezer until ice crystals form (about 30 minutes).
In a saucepan, combine water and lemon juice. Sprinkle gelatin over the surface and let stand 1 minute. Stir in Splenda Sweetener.
Cook over medium heat, stirring constantly, about 2 minutes or until gelatin dissolves. Stir in lemon zest and lemon extract.
Using an electric mixer, beat evaporated milk at high speed until soft peaks form, about 5 minutes. Gradually add gelatin mixture, beating until mixture is combined. Do not overbeat.
Pour mixture into crust; cover and chill 1 hour or until set.