Desert Island Era for All: Sign in to the Seawater Distiller at the Start

I just traveled to a world composed of desert islands and oceans. Ye Changsheng was shocked! He discovered that not only he had traveled through time, but also seven billion people around the world. Everyone is lying on a desert island. A game of survival is playing out. Then the global race for survival begins. At the same time! Ye Changsheng's awakening sign-in system. Check-in for a day: seawater still, Sign in for January: Ten mermaids, Sign in for one year: one armored battleship. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.