And many kids love keeping hundreds of wigglers for pets. There are several companies in Canada now who can sell you the bins, bedding, worms and all. Covered Bin Your worms can live in a plastic bin or wooden box, with plenty of airholes punched in the sides and top. Line the worm bin with nylon net to keep the small ones in. Holes in the bottom are needed for drainage, so you'll want a tray under the bin.
Some people move their worms out to a balcony or yard in warm seasons.
You may find it more convenient to have several smaller, more portable units rather than one large one. The size of the box will also depend on how much space you have. Bedding Loam or black topsoil, available from garden centres, makes a particularly good bedding material. With a lid on the bin and regular feeding of the worms, maintaining the correct moisture level shouldn't be difficult. Redworms normally live in barnyard manure piles, and feed on fresh organic material.