Question: what can whey be used for?
Answer: Substitute whey in any baking recipe that calls for water (or even milk). ... 
Use whey to lacto-ferment vegetables, condiments, sauerkraut, chutneys, jams, etc. ... 
Use whey to soak grains, Nourishing Traditions style. ... 
Freeze it for later. ... 
Use whey to cook pastas, potatoes, oatmeal, or rice.