Quit smoking and avoid secondhand smoke. Smoke has been shown to play a factor in Prostatitis, although no in depth medical studies have been performed to find out the reasoning behind this.
Masturbate or have sexual intercourse at least twice a week. Ejaculation actually helps to fight against Prostatitis and men who follow this suggestion notice a drastic improvement in the condition and symptoms after a few weeks.
Take a Sitz bath daily. Sitz baths have been shown to help improve the symptoms of Prostatitis and are very effective when done daily. Ideally you should soak in a Sitz bath for a total of 20-30 minutes.