Mix evaporated milk with the regular milk.
Add pudding mix and beat well.
Chill in fridge for 5 minutes.
After the 5 minutes, fold in cool whip. Spoon 1 cup of pudding in the bottom of a bowl, pan or whatever you are using ( I use the throw away tin foil pans)
Top with some bananas, some wafer cookies and some pudding. Repeat this step 2 more times, ending with just pudding on top. ( sometimes if I have leftover cookies I will crumble them and sprinkle on top) chill thouroughly and enjoy.