Problem solving - week one

It has been 3 weeks since Sarah and Ali were shipwrecked on a deserted island. Things have been really difficult. They ran out of food and they eat coconuts day and night.

Your task:

Sarah and Ali can't last a day without water. Your job is to figure out how to get them fresh water. You must answer the following question: Can the shipwrecked children just drink sea water?

Hint: Salt water has low concentration. Salt molecules take up more space then water molecules. Cell dries up and dies.

Your tools:

a bucket, bamboo, saw, palm leaves, matches, driftwood, You have all you need. It is now up to you!