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How to make a lava lamp with household ingredients
Rinse out a large soda or water bottle.
Any tightly sealable container works, but you probably have an empty water bottle laying around somewhere. Try to find one that holds at least 16 ounces or 500 milliliter, so you can clearly see the display.
This method is safe for kids to follow on their own, and much faster and easier than making a permanent lava lamp. Young kids can ask an adult to do the pouring for them.