The future is a scary place, yes -- but one thing we don't need to fear is being unaware that we're thirsty. Research and development firm Cambridge Consultants will be showing off its intriguing "i-dration" concept fitness water bottle at CES in a few weeks, combining a series of sensors on the bottle itself that communicate with an app you've got installed on your smartphone. The bottle will measure ambient temperature, how much fluid you've pounded, and how often you've consumed it; the phone, meanwhile, will use its accelerometer to measure how hard you're working out and combine that with heart rate data from a chest st
