Beat sweetened condensed milk and ice cold water for 1 min
Add instant vanilla pudding mix and beat for 1-2 min
Cover and refrigerate overnight
Whip/beat heavy cream until stiff peaks form (~5 min)
Add pudding mixture and vanilla extract
Mix
Layer ⅓ of Nilla Wafers, bananas, pudding mixture
Repeat 2x
Add crushed Nilla Wafers on top
Cover and refrigerate for 6-8 hrs