I am not much of a soda drinker. After repeatedly reading that liquid calories are the bane of weight loss, I am not often tempted by soft drinks. Even the promise of a calorie-free soda doesn't sway, since diet soda is not really good for your health.This morning, I saw this public health advertisement on the back of a bus, challenging folks to a soda-free Summer. Of course I think it is a great idea, but I wouldn't be giving up anything so it is easy for me to think it's cool. What about you? Do you think this a good idea? Would it be easy or hard for you to do?