【Marine】If you had to take one thing to a deserted island, what would it be? Story 6

This is a manga about three people working together to live on a deserted island.
This is the story of a man and his family who live on a deserted island, and how not to drink seawater even if your body lacks salt.
The story is about how to capture and dismantle a wild snake.

This is a 36-page work.