A lot of people on YouTube believe most of these supercooling videos are just sodium acetate. This is a video of me supercooling Fiji water(no sodium acetate), which seems to be the best at supercooling out of all the other ones I have tested.
If you want to try it for yourself, just get a bottle of purified water, I used Fiji water because it's worked out well for me, and put it in your freezer for about 3-4 hours. After about four hours, if it's not frozen in any way, it should be supercooled(some freezers could take longer). After that, just slam it against a table/ground and watch the crystallization process. If you're interested on how supercooling works this wikipedia article should give you a brief explanation on how it works.
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