I've seen a number of different recipes for a tornado in a bottle all over Pinterest. Many used two bottles connected together, but for 100 kids I just didn't want to mess with that. I tried a few that included dish soap, and while the bubbles showed off the swirling, it eventually got too bubbly to see. I then found some that used colored lamp oil, which was REALLY cool, but that stuff was too expensive for 100 kids. I went with vegetable oil instead. Each kid needed: 1 bottle of water (I…
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