I have a love-hate relationship with zero waste. We practise a lot of the things it preaches, but as so many other initiatives, a lot of people take it too far and become legalistic. I also think a lot of people are blind to the plastic etc. that is produced up stream. On the other hand, it is movements like this that get people interested who otherwise wouldn't be and that's worth a gold medal for sure.
I will jump straight in and read the posts you already have up and I hope you gain some great insights from your challenge.