Bedding:

Corrugated cardboard is an excellent material for bedding. Be careful not to breathe in the dust if you shred it. Corrugated cardboard holds moisture better than any other material. Some people use a piece of corregated cardboard to cover their bedding. In a "wet" environment, it can help to absorb some liquid, and will eventually disinegrate.
Shredded newsprint and computer strips can be used. The papers should be shredded in long lengths of ¼" wide strips. It’s easily moistened, but the strips don’t keep the moisture as well. Strips provide more surface area from which the water can evaporate. They require frequent moistening. The black ink used for printing the newspaper is not toxic to redworms. The main ingredients of black ink are carbon and some oils. Colored ink should be avoided. There used to be heavy metals, such as lead and chrome, in colored ink. US Government regulations now forbid the use of heavy metals in colored ink for printing newspapers.
Shredded newspaper is the most economic material. Make the strips from one to two’ long by ½ to 1" wide. Redworms will eat the paper after it has softened.
Some people may object to the initial odors of animal manures. It is not recommended to use manures if the box will be located in your living area! Animal manures have other organisms such as mites, sowbugs, centipedes or grubs that you wouldn’t want in your home. But if the box will be outside or in a garage, manures would be fine. Worms really like manures. Reminder—no pet, people or pig manures!
Old decaying leaves are a good source of bedding. Some leaves are better than others are. For example, maple leaves are preferred over oak leaves, because the latter take longer to break down. Leaves from trees growing along heavily traveled roads could be dangerous because of possible lead accumulation on the leaves.
Peat moss can be used if mixed with other bedding materials. It has an excellent moisture holding capacity, however it provides no nutrients for the worms, and can be expensive.
A handful of soil provides the grit worms need for breaking down food particles within the gizzard. Since worms don’t have teeth, their food must be broken down by muscle action in their gizzards.