I know this is probably a long shot, but... I enjoy eating plain yogurt, especially the Erivan brand, very much, and it often has about half an inch of liquid at the top, which I am told is whey and usually poured off the yogurt. Well, I love the whey, and I'm wondering what yogurt manufacturers do with it. do they ever bottle and sell it? I have seen powdered whey, but that's it. I can imagine using whey in cooking or even drinking it straight, so I'd like to get my hands on some if possible.
Make your own cheese and you'll have plenty of whey!
It's all around the lovely ricotta or whole milk mozzarella that you can buy.
I linked below if you are interested in making your own cheese - some things (like mozzarella) are very easy and yield quite a bit of whey.
Whey can be used to make great sauerkraut and other pickled vegetables. Pick up a copy of Nourishing Traditions by Sally Fallon - it has a significant chapter on dairy (yogurt, kefir, etc.) and its uses. My problem was that I couldn't find liquid whey (the powdered stuff doesn't count) - so I took the Erivan and hung it over a bowl in cheesecloth overnight - not only did I get my whey, but I got cream cheese (albeit a very sour one).