their was a lady that had a soda bottle cut a opening in the side and filled it then close it back trying to find it but cant

Here's a youtube tutorial showing how they are made.

http://www.youtube.com/watch?v=wT2847dhz2M

I have made some of them for my grandkids and they just love them.I love making them for family members and see the look on there faces when they wonder how I got the stuff in them.Then I tell them how.Have fun making them I do.