I figured that since we love to make things ourselves isntead of buying something here, there might be some yogurt makers here.
I make it now and then, and it's great. Super easy. Basically I take some milk (I usually have 1% or 2% at home) and heat it until it's close, but not boiling. I then add some skim milk powder (i never actually measure but i would bet it's about 1/2 cup per 2 liters of milk), stir it up and let it stay hot for a while (this is to hopefully kill any wild bacteria). Then I cool it down. Once it is cool to the touch (still warm), I transfer it to a plastic container and add a couple spoonfuls of store bought yogurt (or from my previous batch). Make sure the yogurt has active bacterial cultures. You then place it in an oven that was heated for a minute or two, and turn the oven light on (this will keep it warm). Leave it overnight or until it solidifies.
I have never been overly worried about sanitation, but I have also had a few batches that turned out lumpy or watery (but still tasty). I'm not sure if that had something to do with wild bacteria.