How do I make an egg survive a 20 foot drop?

I’m totally out of ideas for our project and would appreciate any help!

So for the project…
-The egg has to be in a 2 liter soda bottle which has to be opened
-The egg has to be visible, so you cant just pack stuff in there
-Cant weigh more than 1 pound
-No commercial packaging (foam, etc)
-Raw eggs, no boiling etc

Any help would be appreciated!
I was thinking of filling the bottle with water, but I’m not if thats good

fill it with cool whip it is more airy and fluffy then water.