You can get the complete bucket and lid - http://goo.gl/6zOny
Or provide your own bucket, and just get the lid - http://goo.gl/yF9M1 or http://goo.gl/9VHYO4
Step 1: Cover Material
Cover material can be grass clippings, Peat Moss, Coconut Coir (recycled coconut fibers), ground up corn cob, or even sawdust (raw wood preferred, not kiln dried). Our favorite is the Recycled Coconut Coir (a waste product from the food industry) and the ground corn cob.
Put about 3" in the bottom of the bucket before use to act as a liquid absorbent and after every deposit, cover with another inch or so.
Some folks use a plastic bag liner, especially when camping. This makes it easier to keep the bucket clean, but harder to compost, as the bag needs to be disposed of. Biodegradable bags exist, but still problematic for composting. Perfect for camping in the woods.