learning to make yogurt on the internet is a fairly frustrating challenge.  
Making it isnt particularly hard, however hunting through mom blogs and health blogs is a bane.


1/2 gallon milk
2tbsp regular yogurt.

-boil milk for 20 minutes.
-reduce temp to 110
-combine 2tbsp regular yogurt with warmed milk
-add the milk mix back to the yogurt to stay warm at 110f or 40c 
for 8-10 hours.  

strain as necessary.