you can make kefir yourself if its too expensive for you in England.
Then have a look at the food allowed list, there you find everything we eat here on the diet. Why we say you should try to find organic Greek yoghurt has to do with the fact that it is very low on sugar.
This Swedish webshop has SF222 and very good probiotica. I ordered my stuff from them.
I think i read somewhere that Able said that the white flem stool is a sign of death candia coming out of your system. But ask him for that again just to make sure.