Quoted from bumblethru

Witchcraft!

I used to keep bottled water in my car and some would freeze while others wouldn't, I always just thought the water companies were putting something in the water

The water in the bottles which did not freeze overnight was "supercooled." Water normally freezes when it is
cooled below 0 degrees Celsius, forming ice crystals. Ice crystals form more easily when they grow on existing
ice crystals -- the water molecules like to pack themselves in place on a crystal that's already gotten started.
It doesn't take much to start the crystallization process going -- a little piece of dust or other impurity in the
water, or even a scratch on the bottle are sometimes all it takes to get ice crystals growing. The process of
starting off a crystal is called "nucleation."

In the absence of impurities in the water and imperfections in the bottle, the water can get "stuck" in its liquid
state as it cools off, even below its freezing point. We say this supercooled state is "metastable." The water
will stay liquid until something comes along to nucleate crystal growth. A speck of dust, or a flake of frost
from the screw-cap falling into the bottle are enough to get the freezing going, and the crystals will build
on each other and spread through the water in the bottle.

Quoted from Henry

I used to keep bottled water in my car and some would freeze while others wouldn't, I always just thought the water companies were putting something in the water

They were.
Obviously, they were putting Flouride in there, because it's in their best interests, to spread autism by any means possible