If it dries out, the worm cannot breathe and will die. Too much moisture will drown the worm. They prefer certain tree leaves to others, and certain plant material to others. Instead of putting foods down the garbage disposal, feed the earthworms, and later, your plants. Turn them under with a garden fork so the worms can enjoy the young tender growth while they are newly sprouted.
Many people put eggshells in the compost pile.
Nevada soils have an abundance of calcium so eggshells are not recommended. A bin can be easily made out of cinder blocks. Start with a small area. When the debris reaches four or five inches, throw on a thin layer of soil. This is important because soil contains many small organisms that contribute to the acceleration of the decaying process.