Do you have a recipe or instructions how to make viili starter (pohjapiimä) from ingredients available in the U.S.?
In Finland there are two kinds of viilis:the short and the long one, which is more "stretching". For the short viili You can make the starter. Look at: http://www.home-media.com/camdenews/recipe.htm and http://www.futurefoods.com/ --->information sheet --->Ferments.
But for the long viili it is more difficult. You could ask for more information from Valio. The Internet adress is: http://www.valio.fi/index.shtml