I have the standard issue double tote system - vents on top, drainage to bottom tote . . . only good for about a family of 2, and definitely not vegetarians. It works for me because I have 2 additional yard compost bins.
And this is what $20 worth of worms looks like - about 500. Fresh from the manure pile. The only place to get the correct type of worms. And yes, you do need to use the Eisenia fetida. A worm bin is perfect for a small space, even indoors. It is small and odorless.
These guys are snacking on a few coffee grounds, part of a tea bag and eggs shells.
Worms will eat all vegetable and fruit scraps, although I do not include onions when I feed my worms.