Tap Water vs. Bottled Water

My students watched a video on Tap water vs. bottled water and then use the clickers to help me determine how many kids wanted to sell bottled water in our hydration station. This is where the challenges occured. I asked students to answer yes or no to the question "should we still sell water bottles?" I recieved all different kinds of answers...like yessss, yes, yeah, yipee, N, no, nooooo, na, maybe. So I tried to be more specific...I asked them to put ONLY Yes, NO. Again I received different answers...so I tried having them put just y and n. They couldn't follow these simple directions either. So I never did get a chance to find out how many wanted to sell water bottles and how many didn't. My other challenge is usage of the clickers. At this time I am only able to use clickers in the Health room and we are not in there on a consistant basis. So I used the clickers and then Colin asked us for pictures of learning. Needless to say, I didn't get pictures of learning. I will try again.