Each 5 gallon compost tea brewer comes with one brew kit to get you started. Additional kits are available.
The KIS brew kit contains one mesh bag of compost and one plastic bag of microbe foods. The high-quality compost (about half-and-half worm compost and garden compost) in this kit is produced locally in Victoria. Additionally, the compost is enhanced with "Penergetic for Compost" powder. Tip: The mesh bag can be washed and reused!
You can also come up with your own compost tea ingredients, but then you really need to get into testing them to make sure you make a good tea, so for most people, it's better to buy the kits that are proven to work.