What gets me back in the zone is when I'm sitting down rigging up my rods the night before. It just gets me fired up for the next morning. Sometimes I listen to some music I like while rigging up. And then the ride to the lake is a great way to get in the zone too.
Getting in the zone for me is as simple as talking about the upcoming trip to the lake with buddies. Cussing and discussing what should and shouldn't work, looking online at the weather forecast, lake conditions, etc. Few tackle shop chat sessions works also!