Hi all! I'm still very new to brewing, and recently brewed an IPA (2 weeks ago). I bought two bottles of extract from a local home brew shop. They were 6 lbs each, of course the recipe called for 5 lbs and 4 lbs, leaving me with some leftovers. They came in plastic containers, same as milk, and I just capped them and put them aside. Is there anything I can do with it? I'm assuming I shouldn't use it to brew another beer?