This problem involves the question of survival. What people need most at sea is water, not food. If there is real danger at sea, the first thing to be solved is the drinking water problem, not the food problem. People will die of thirst, but they will never starve to death.

When people go out to sea, they will reserve enough water and food. You can't survive unless there is danger. In this case, in the process of waiting for rescue, solving the water problem is always the first. Without food, a person can live for 20 days, but without water, a person can't live for 3 days. Therefore, people at sea may die of dehydration, but it is difficult to die of hunger.

At sea, if you meet an island, there is often water and food on the windward slope of the island. If not, we must rely on our own strength. The best way is to collect rainwater and condensed water. If you drift on the sea, you can erect an "awning" on the boat, so that the water vapor in the air will rise to the top of the awning, and after cooling, it will become water droplets and flow to the bottom of the boat. So you can collect it. If there are branches and leaves, put them in a plastic bag with the mouth facing up and the corner facing down to collect condensed water. This is a common method, and fresh water can also be collected from animals.

Fish eyeballs are rich in water and can be eaten directly. Fish spine contains not only drinkable bone marrow fluid, but also a lot of protein. As for fish, you can cut it into small pieces, or cut it with a cross and squeeze it hard to get some water. You can also take out the internal organs of fish and drink them. Generally speaking, eating about 3 kilograms of fish every day can meet the most basic water demand. In this way, we can not only get food, but also replenish water.