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 strap. After crunching some numbers, the app determines whether you're low on H2O -- and if you are, it'll make a blue light on the bottle pulse. If it seems like a roundabout way to stay hydrated... well, that's because it is, but Cambridge's angle is that this is a demonstrator for cool new ways that sensors can be tightly packed and integrated with smartphones to create "hardware apps." Speaking of, we could use a tall, cool glass of water. Follow the break for the full press release.