What a great idea. Make your own I SPY game with a VOSS water bottle. You fill it with rice and drop in little things to hide and then make a list of everything in the bottle for the kiddos to find. This is a great travel activity.
Click through for great instructions on how to make these sensory play bottles for babies. Older brothers and sisters can help to make them with the help of Mum or Dad. The Imagination Tree: Baby Sensory Play: Discovery Bottles
Make your own lava lamps! Plastic bottle + vegetable oil (half fill the bottle) + water (fill the rest of the bottle + 10 drops food coloring + alka-seltzer (broken into pieces, placed 1 at a time into the bottle) = lava bottle
Attention all my preschool teacher friends - Fish craft! Thanks to magnets hidden under the lid, this goldfish shimmies, quivers, and floats in its jam-jar bowl just like the real thing. way better then real fish!