Heat the milk & milk powder in a saucepan until just before boiling.
Leave it to cool for 30 minutes.
Stir in the yoghurt.
Pour it into a pre-heated thermos flask and leave it in a nice warm spot for about 8 hours to do it's thing!
One it's set pour it into your Sinchies reusable food pouches and put it in the fridge to cool and stop the culturing process.