Cooking: No-bake Key Lime Pie

I love to teach my kids to think creatively when it comes to cooking.  Sometimes with delicious results, others with a bit more disastrous effects.  But the more creative cooks they are, the more likely they'll want to cook throughout their lives.  So when I saw the cute key lime pie-in-a-jar recipe in Pinterest, I was intrigued.  However, I prefer no-bake key lime pie and I thought the serving size of a pint jar was a bit large.  So here's my variation:

No-bake Key Lime Pie-in-a-half-pint:

Makes 10-12 half-pint jars, or one generously filled pie

Ingredients:

Graham cracker crust ingredients for one pie
1 1/2 cups whipping cream
1/4 cup powdered sugar
1/4 cup cold water
1 envelope gelatin (Knox)
1 can sweetened condensed milk
1/4 cup (or more) key lime juice
2-4 drops green food coloring

Crust:

Regular graham cracker crust recipe for one pie - (see http://nutritiousintent.blogspot.com/2013/05/graham-cracker-crust-boosting-nutrition.html for my nutritionally boosted variation)
Divide evenly between 10-12 half-pint, wide-mouth jars.

Filling:

Whip 1 1/2 cups whipping cream with 1/4 cup powdered sugar until stiff.  Put half in a pastry bag with a large star tip and keep in the refrigerator until ready to use.
Fill small bowl with 1/4 cup cold water.  Add 1 envelope gelatin (Knox) and let soften for a couple minutes.  Then microwave for 30 seconds to 1 minute until completely dissolved.  Pour this liquid gelatin over cream, add 1 can sweetened condensed milk, 1/4 cup (or more to taste) key lime juice, and a couple drops green food coloring.  Beat until soft peaks form.

Using an ice-cream scoop - divide the filling among the jars.
Pipe whipped cream on top and refrigerate 1 hour or more until ready to serve.