The first activity we did when the kids arrived at the party was for everyone to make their own I Spy Bottle. I got the idea from here. I ordered the Voss Water a couple of months in advance so I could use the bottles for the party. I set up 21 little trays all with small objects in them and let the kids add one from each tray to their bottle. After they were done choosing their I Spy items we filled the bottles about half way full with Plastic Bead Pellets. I also added a little super glue to the lid before I sealed them up.