In the book The Cay Why did people in Aruba run out of vegetables and water?

In the book "The Cay" by Theodore Taylor, the people in Aruba did not run out of vegetables and water. It was Timothy and Phillip who were stranded on a small cay (island) after a hurricane and had to survive with limited resources, including finding food and water. The people of Aruba were safe on the main island and had access to supplies.