okay if it is done fermenting no need to add nutrients, if not yes add nutrients and aerate. if it is finished fermenting pour it into a bucket and add k meta, get a power drill with a paint mixer on it or use a paddle manually and stir the living crap out of. I would stir it for like a half hour or so. then splash rack it into a carboy and top off. wait about a week and smell it again. if it still smells repeat the procedure only this time use a copper pipe to stir it with. if that doesnt work then you may have a severe sulphur problem and you can either dump it or use copper sulfate and risk getting sick from copper poisoning...good luck.