I used to be a product demonstrator for Soda Stream last spring in 2011 and I had fun talking about the product and meeting every skeptical question dead on with a great answer. Soda Stream is a product where you make your own seltzer with compressed CO2 and add soda and seltzer flavors. I just started up again this Saturday, March 17 2012 and fell right back into the old routine and was just as knowledgeable and…