bandaid taste can come from chlorophenols. chlorophenols come from a reaction when there is too much chlorine or chlorimine in the brewing water. so it was probably a tap water issue. in the future, only use all R/O or distilled only if you're planning to add minerals. you can either cut your tap water w/ R/O or distilled, or you can use spring water. spring water has some of the minerals you want, but not all the stuff the city adds to keep it clean like fluorine, chlorine and chlorimine.