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.
A new twist on classic baking soda & vinegar. Magic Potions and Fizzing Formulas - one of the best kids' science experiments EVER! Added bonus - you can use the same combo to get them to clean the bathtub!