its simple... really it is...
the dew collector creates the water from the dew it collects (you do nothing in this process except go do something else), when it creates the water the moisture creates a jar from dust (hey i can speculate) but seriously, it just makes a jar of drinking water up to 3 pending how much time passes.
as for boiling, you still boil murky water when/if you find some and only if you have a cooking pot.
no more hunting down jars and or no more crafting jars from sand and stuff. this gives you time to go looting to find more crafting magazines and hopefully in the process you might find some more murky water.