Clean quart Mason jar with lid (+/-$3)
Kefir starter ($26.95 for a 6 pack, each 6 pack. can make 2 gallons, a quart at a time, found here: http://bodyecology.com)
One quart milk (any type you like, including skim, and coconut water)
Wonder box, (about $15.00 to make, info found here: http://thermalcooker.wordpress.com/category/thermal-cookers/wonderbox/)
Pour the milk with the starter into the Mason jar. Screw on the lid.