Quick question. I completely forgot to add the pumpkin pie spice to the last 5 minute boil of a brown ale I'm doing for Halloween (after years of using real pumpkin I've found it to be pointless and a pain). Figured no big deal and will do a vodka tincture at kegging. How much vodka? Never made a tincture before. Do I just mix spice in vodka with spoon and just rack on top in keg? Plan on using about 4 oz, I know it's a lot but 2 0z never comes through enough. Thanks!