You'll read lots of folks here who will say don't do it, but I'm with Gila on this - its just cooking. What we do when we say we're "brewing" is cooking, just like any other cooking. Take a slow cooker - does anyone worry that their chicken and rice is going to taste like chili because they use the same pot? Its a pot, not a holy shrine. Clean it, use it, clean it , use it again, no big deal.