A bruising battle between the Central Arizona Project and many states and water users has revitalized the push for a stillborn plan to prepare for more drought on the Colorado River. The original dustup was over whether the CAP was seeking to “game the system” of reservoir operations at lakes Mead and Powell to benefit itself at the expense of the river’s Upper Basin states: Utah, Colorado, New Mexico and Wyoming. That’s prompted new talks to try to also resolve longstanding differences with another of CAP’s adversaries, the Arizona Department of Water Resources.