OK, I have a few questions about my kefir! 1) I'm drying off my only milker right now and won't have milk again until March, can I make kefir from pasteurized cow's milk from the store? 2) Can I make it with skim milk (either goat or cow) 3) Does kefir contain the amount of fat of the original milk? I'm guessing yes but it could do something to the fat that I don't understand! Thanks!