Bandai Magic Pet

Forget adding colors and flavors to your kid’s water to make it more interesting. Get a couple of these Bandai Magic Pets ($21), pop them in any handy water bottle, and your refreshing beverage has just been transformed into an aquatic wonderland. They have no motor or batteries, but these squidlike beings are mysteriously able to swim up and down, and spin around while waving their tentacles at you.