sorta, basically everyone got it right already. there arent enough minerals in the water to disturb the hydrogen bonding between the water even though its cold enough to freeze. Also the bottle is so smooth that the water molecules prefer to bond to each other than to the bottle. IF you were to scratch/nick the inside of your bottle this would give the water a spot to start crystalizing which would then form its secondary structure in a crystaline lattice formation… ice. also you could try to drop a grain of salt or something into the supercooled water and it would also cause rearrangement of the molecules and immediate formation of ice, or boiling if the water is hot. there were lawsuits about this agains pyrex a few years ago because some of their glassware is so perfect that if you microwave water for say 4min so it is hot enough to boil, the same principle would happen and the water would look normal, but as soon as you agitated it or put a spoon into it etc, it would boil immediately spraying people with boiling hot water…