You wake up. It is a fine spring morning. You take a deep breath of the crisp March air as you walk to the subway to go to work. It is also one of those mornings where the subway is so packed you are staying upright only by the pressure of all the other commuters sardined in beside you. The train finally arrives at your stop and you topple your way onto the platform.

Relieved to be free of the sweaty throng, you enter the mall to head to your office. You are suddenly very thirsty. There is a water fountain to your right. But there is also a Starbucks on the way. If only coffee wasn’t so dehydrating.