Keeping vegetables and fruit fresh is very important. Here is a simple idea for a low-cost cooler. Take a large deep cooking pan, with no handles, to the local potters. Ask the potter to make a large, unglazed clay pot with a lid and a rim or ledge inside which can support the pan. The pot needs to have a lip through which water can be poured, some ventilation holes and a wide space between the walls of the pot and the pan.