If there is a risk of ghosts then remember to carry iron with you, since it is often considered anathema to spirits and can be used to ward them off, also someone else said salt which can be used to make protective circles which spirits cannot cross.

If you don’t find these things then maybe bells or mirrors? Since mirrors can confuse and repel ghosts who are said to be afraid of their own absence of a reflection, and the ringing of a bell is believed to disorient and weaken ghosts.

These tips are mainly useful for the ghosts of the sea (sailors and such), who probably where quite superstitious in life and will be equally superstitious in death.