They will burn the firewood ,fill their pot with the ocean water.the water will boil and evaporate leaving salt in the pot on fire. they can use the other pots to collect the water vapours by keeping them above the pot on fire.
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thank you for giving this answer, but i want diagram for this
  • Brainly User
The passengers will fire the firewood by a matchstick after tht they can  evaporate the water thiswill make the water fit for drinking.

thats the reason for ur ans