All users have to do to create drinkable water is pour dirty or salt water into the cone's black base, place the cone atop it in the sun. As the water evaporates upwards it condenses on the cone's inner wall and tricles down into a seperate trough. To access the clean water simply lift the cone and pour.
Link - via treehugger
From the Upcoming ueue, submitted by whitespace.
And kudos to Jay for pointing out the old, tried and trusted method of creating drinkable water from a still! :)