Ask Your Nanny-Freezing Water in Plastic

This week's question was about freezing water.

Question: Why is it a bad idea to freeze water in a plastic container?

If you try to freeze water, juice or other liquids in a closed plastic container without leaving room for expansion, your container will crack or burst. It's better to fill plastic bottles or jugs with liquid, leaving plenty of room at the top for expansion. Once the liquid is frozen, then you can safely tighten the lid and then when you want to take it off use warm water to wash it then take it off.

The reason why it's a bad idea to freeze water in a sealed plastic container is because the container can break. I would say if the water bottle is full and you freeze it then burst open and then it will be an even bigger mess then if you just started with a half full bottle. Which works just as well.  Leave at least a 1/4 of the plastic without water because water expands.