Going into my second season making wine, I have a couple of questions. I need to purchase a 10gallon fermenter. Besides the brew store (expensive) are there other places to purchase large, food grade plastic buckets? Also, do I need to use a cover? When the grapes are in the fermenter, what kind of cover do I need to have over the top? Will a sheet or blanket do? One more, is my sulfite still good from last year or will I need to buy fresh? Thanks!