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1
In a large saucepan, combine the tap water and dry milk powder.
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2
Stir well.
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3
Let it sit, then stir again.
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4
Heat the milk over medium low heat until it reaches 180F.
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5
This kills off any competing bacteria so that the yogurt will respond better to the acidophilus cultures.
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6
Remove from the stove and allow to cool to 115F.
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7
If the milk is hotter than this, it will kill off the yogurt cultures.
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8
Add the store bought plain yogurt to the warm milk.
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9
Stire well.
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10
Allow it to sit for a few minutes and stir a final time.
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11
Pour the mixture into a very clean, quart sized container.
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12
A quart canning jar or an old yogurt container works well.
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13
Now you incubate the yogurt.
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14
This method works well for me: Fill a large preheated thermos about half way with hot tap water.
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15
Place the container with yogurt inside the thermos, being careful to not allow the water to get into the yogurt.
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16
Set the lid on top of the thermos.
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17
(Other people have put the yogurt in a barely warm oven, or put it under a heating blanket, or even let it incubate in a warm car!)
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18
Check the yogurt after a few hours.
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19
May take up to 8 hours.
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20
When the yogurt is thick, it is done.
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21
Refrigerate.
