An article [original, free registration required] over at Medscape mentions some finding that may be a step forward in the fight against psychosis for some patients. Researchers found that a 12-month regiment of omega-3 fatty acids reduced or eliminated full-blown psychosis compared to placebo by 22.6%. They also found that these benefits continued for up to one year.
For now the standard treatment is pharmaceuticals which, like many other classifications of drugs, can have negative side effects. Since it has been said that patients families can suffer more than the patient it would make sense that the patient would opt off said stigmatised pharmaceuticals. If, in the next ~10 years, this turns into a viable treatment it could help to eliminate otherwise avoidable situations due to a refusal to take medications.