This is our worm bin (between Charlie’s bowl and toys.) Here it is 2 tier; at the moment it is 3 tier. It is made from ordinary plastic bins with lids. There are wood pieces inside to space the tiers about 8-10 inches apart.
The upper tier/s have holes drilled around the sides and in the bottom – this gives the worms air and allows excess liquid to drain into the bottom bin (which has no holes).
The worms were ordered from Uncle Jim’s worm farm (I’ve seen the Google ad on this page). They are special “red wigglers”, not earthworms. They come through the mail in a special moist package labeled “live worms.” We use strips of newspaper that are moistened as “bedding.” Kitchen scraps can be buried in the bedding…just about any kind of scraps (except meats, fats, oils and excessive citrus rinds). Coffee grinds, I hear, are a favorite of worms.