One of the greatest hardships of getting stranded at sea has got to be sitting on a monormous reserve of water that you can't drink, while slowly boiling toward dehydration in the pounding sun. Forget the delirium that will ensue should you drink any of the salt water around you, just thinking about that evil irony is enough to drive anyone mad.
Now, if you were sitting on the Sea Kettle life raft, you wouldn't need to think about it, because you'd be enjoying a cool cup of water thanks to the vessel's built-in desalination system that makes use of the sea's most abundant resources: salt water and sunlight. The system uses evaporation to produce potable water out of salt water.
Unlike those open-top rafts, the Sea Kettle is a floating tent of sorts, allowing you to escape the UV rays and elements. The raft is also painted bright orange and yellow, and appears to have an X on top, for easier rescue sighting.
A design from a couple of years ago, the Sea Kettle is unfortunately just a concept.