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I've had the same thing happen with Gatorade, I put it in the freezer to get cold, when I open it, I can see ice form instantly in the bottle, and I get a slushie drink. Now how can you explain it with a non alcoholic, non carbonated beverage?



You beat me to it. I have the exact same thing happen.
Near as I can figure, the liquid gets to just past freezing temperature, and water unlike many materials expands as it freezes. This expansion compresses the air in the bottle, slowing the rate of expansion and thus the rate of freezing.
When the bottles is opened, the liquid is allowed to expand and become (semi) solid.
If it is left in the freezer long enough, of course, it will freeze solid in the bottle.

When my son (Chem major) wakes up, I'll ask him.

Contra todo mal, mezcal; contra todo bien, también