Magnolia Bakery's Banana Pudding

From The Complete Magnolia Bakery Cookbook 

Ingredients

1. 1 1/2 cups water
2. 2/3 cup instant vanilla pudding mix
3. 1 (14-ounce) can sweetened condensed milk
4. 3 cups heavy cream
5. 1 (12-ounce) box vanilla wafers
6. 4 bananas, sliced

Directions

1. Mix together the water, pudding mix, and sweetened condensed milk until smooth. Refrigerate for at least 4 hours, or overnight, until it sets up.
2. Whip heavy cream until soft peaks form. Working in thirds, fold the whipped cream into the pudding mixture until well incorporated.
3. In a trifle bowl, layer vanilla wafers, sliced bananas, and pudding mixture; continue until you've used up all the pudding mixture. Refrigerate for at least another 30 minutes before serving.