SELF-INFLATING RAINBOW BALLOON! 🎈🌈 Watch a balloon magically blow itself up with the power of fizz! The Fuel: Pour 1/2 cup of vinegar into an empty plastic water bottle. The Colorful Trick: Add a few drops of food coloring into the vinegar (or put drops of different colors inside the balloon itself for a swirling effect!). ​ The Charge: Use a funnel to fill a balloon halfway with baking soda. The Setup: Carefully stretch the neck of the balloon over the mouth of the bottle—don’t let the baking