@Kaneki-kun To die in peace for a person means to die while being content with everything he have in his life,like he is not having any regrets in his life and he is neither afraid nor sad that he is dying.
Before you go to sleep, paint eyeballs on your eyelids so God thinks you're still awake in your dreams. It will throw out His callibrations in your favour.
@I-AND-ME well since you said donate you took drugs out as way to die. You'd want something quick or painless right? Jumping off a bridge just fucks your organs. Prob strangulation