To color the rice: Pour rice into a Ziploc bag. Add two tablespoons of rubbing alcohol and a few drops of food coloring. Shake bag until all the rice is colored. Lay the rice out to dry for a few hours (or overnight, in our case).
When you pour the rice into the dry water bottle, make sure you leave plenty of room near the top so the rice can move around when searching for the hidden items.
It might be a good idea to attach a small list to the side of the bottle to remind you of what's hidden inside but I'm hoping I can remember since I'm sure the list will most likely be torn off by little hands.
Some of our items included:
blue safety pin
silver & gold buttons
silver twist tie
green Ninja man
2 foam squares
I think this toy will be fun to take on long road trips! And....don't worry....the cap is super-glued on.