Behind the marble counter at Percy’s & Co., the yawning apothecary-inspired bar on booming old Ballard Avenue, an antique shelf holds tiny vials filled with tinctures meant to boost everything from brainpower to libido. Ask the bartender to add a few drops to one of the herbal cocktails, like the Herrick Helper, made with sage-infused bourbon, grapefruit juice, and soda. Then order up the kitchen’s salt cod fritters with smoked egg aioli, while you wait for the magic to kick in.