As you have said there are many people who have a single psychotic episode with no follow up episodes. The statistic are weak and there is very little in means of predicting if this is a single event. Anyone who says that they can accurately predict the possibility of an additional episode is "blowing smoke", especially since the etiology of the break is unknown. All that one can say that the longer time passes, the less likely that there will be another episode. Best wishes and good luck. Since it has been a year the prognosis is optimistic; however close observation is recommended. I hope that this is clear, if not please feel free to follow up.
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On piece of advice, avoid any stimulants, or illicit drugs. Make sure any GP treating him know as there are certain meds that can trigger a psychotic episode. And as much as possible avoid undue stress.
He doesn't do drugs thank goodness. What stimulants should he avoid and what drugs should I look out for that could produce another psychotic episode?
Energy drinks, excessive coffee. The GP will know what drugs to avoid, but especially blood pressure meds.