And sometimes these bottles can be fun. Occasionaly the water temp will be below freezing and yet the water is still liquid. Give the bottle a quick tap and the water crystalizes in a second or two. Neat.
A few times I have taken a water bottle where it was liquid, until I cracked open the seal, then it turned into a water slushy. It's still perfectly drinkable, but I just prefer my water not to be chunky.
