Explore "Manners and Customs of the Thrid" by Murray Leinster on Textopian. Read with annotations and highlights.
The copter came, it dropped food and water, and it went away. It came, dropped food and water, and went away. Once a water-bag burst when dropped. They lost nearly half a week's water supply. Before the copter came again they'd gone two days without drinking.
There were other incidents, of course. The dried seaweed they slept on turned to powdery trash. They got more seaweed hauling long kelp-like strands of it ashore from where it clung to the island's submerged rocks. Ganti mentioned that they must do it right after the copter came, so there would be no sign of enterprise to be seen from aloft. The seaweed had long, flexible stems of which no use whatever could be made. When it dried, it became stiff and brittle but without strength.