Recently I saw this activity at Teach Preschool. When I saw this I knew it was something Hasan would love to do. It's very simple and uses household items. I used apple cider vinegar but I would recommend using white vinegar. Apple cider vinegar is pretty stinky. Hasan loved this activity and it kept him occupied for awhile. Near the end he was complaining that his eyes were burning. I waited for Bilal to go down for his nap so Hasan could play undisturbed.