Polystyrene is not a healthy choice, with some 'buts' depends on the situation.
I can't clearly remember how I've become such a huge Tupperware fan!Thanks to Mr. leong for his marketing. They are just irresistible and the colours are just so tempting that I have to get one myself!(Hmm, I sound motherly=maknenek).
I'll tell you why. just look at this collection of water handolier:
I have one of this green handolier, but i like the blue handler more. The simple string makes it sexier than the given package. So I bought the green handolier and requested for the blue handler.

I take them everywhere I go, and drink more plain water nowadays. (Mineral, not distilled or drinking water.) I feel healthier and energized nowadays.So now, I become Zexier!