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There's only 1/5 pet stores around here with Rena filter media, and it isn't quite everything (they have the stars, but no rings). Every place I go though has stuff like a box of activated carbon or ammonia remover or whatever. It seems like it would be about half the price if I could use this media, but how would I use it? Would I just dump it into the bucket or would I need to make like a cloth pouch for it?

You could use an old (clean) pair of pantyhose. Cut the feet off and put the carbon in there then tie it up

Ah. Panty hose are cheap enough. Thanks.