Quote Originally Posted by Dogmama
Plastic supposedly leeches a chemical that is a carcinogen. So, yeah, use glass. Even to cover your glass bowls. I use a plate to cover a glass bowl if it is a spattering material (like everything I cook!)

I read an article (sorry cant remember when or where) that talked about freezing of plastic. Freezing purchased water in its bottle can also release nasty chemicals out of the plastic. If you do reuse purchased water bottles you should ditch them after a while as the plastic starts to break down and then you are drinking it.