When I got an email invitation to taste a new brew called Batch 19, my friend Tammy of the Lagerheads told me to bring “at least two or three other MillerCoors offerings.” I laughed, thinking that was funny, since she leans toward Belgians and small American craft brewers. I wrote back something about bringing some Bud Ice Lime Light Dry Ultra, or some such buzzword beer. But on the walk over, I called to…