Easi-yo Homemade Yogurt Cheat

I'm sure the New Zealand company Easi-yo won't be all that pleased that I found this money saving cheat. Well--of course many have found it before me, but I wanted to share it all the same for those who have not heard how you can save a few dollars on this deliciousness and get more for your money. My son and I would eat about a litre of yogurt a day if it was possible, and now it is. Without the expense.
And, unlike so many of the recipes on here, its very healthy for you.
So listen up!
You can purchase a packet of dry yogurt mix for around $4, and for those who aren't familiar with Easi-yo, all that needs to be added to this formula is water. The mixture sits in a canister in a thermos of hot water for about 8 hours, and voila! You have yourself a litre of creamy, thick and healthy yogurt.
$4 doesn't seem like much, but if you're eating a litre a day, its worth listening. If you look at the ingredients on the back of the packet, the main ingredient is  powdered milk.
So you can really quarter it, and get 4 litres of yogurt out of one packet as opposed to one litre if you add enough full cream milk powder, and its just as good! You do lose a bit of the original flavour, but you can serve it with fruit if you need the extra kick for your taste buds.

For demonstration purposes, we will simply make two litres from one packet, to simplify the process.

1/2  packet (1 cup) dry Easi-yo yogurt mix
1 cup full cream milk powder
500ml cold water
extra water to top up
1/4 cup sugar, optional
Easi-yo canister

Fill the Easi-yo canister up half  way with the 500ml of water. Add the powdered ingredients, close the lid and shake until mixed through the water. Add sugar if desired. Fill the canister to the top with extra water. Fill the thermos to the top of the red insert with boiling water.
Place the yogurt canister inside the thermos, close the lid and leave for 8 hours before removing and  refrigerating. Save the remaining dry packet mixture for your next batch!

NOTES: There are two cups of dry yogurt powder in the packets. Use the ratio 1 cup of milk powder to 1 of dry yogurt mix.