If you’re going to do a chemistry experiment, you’re going to use chemicals. How much of each one you use is going to change the results you get, so it’s important to find a way to accurately measure out the same amount of chemical each time.
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Hang on – you’re asking about two different experiments! The one about transforming dad’s coffee back into clear water is here: https://www.sciencelearningspace2.com/2010/06/water-purification/ and the one about density is here: https://www.sciencelearningspace2.com/category/unit-3-matter/lesson-1-density/density-experiments/
Which lesson contains the dad’s coffee density video?