With the kefir start kit you can prepare 12 15 weeks worth of kefir the kefir starter kit contains 3 sachets of kefir cultures of superior quality and allows you to make up to 105 litres of kefir each package can be used for 4 5 weeks and produces 1 litre of kefir a day this way you can prepare up to 105 litres of kefir with 1 package of starter cultures purchased from the kefir company