Compost worms need a moist environment. The hungry bin has been designed so that excess moisture drains from the bottom; maintaining optimal conditions. Generally, water should not need to be added to the hungry bin as food scraps have a high water content, which will keep the bin moist.

If the bin appears to be drying out, or you have added a lot of dry matter such as shredded paper or cardboard, water can be sprinkled over the top to increase the moisture level.