Clear the debt. Being in debt is a crisis, and should something happen (like an accident) it will help to have cash availble (i.e. chances of zombie apocalypse = low, chances of issue you need cash for = high, so think about what is more likely)

Also, basic preps can be pretty cheap - storing tapwater in old soda bottles is not optimum - but it's basically free and better than nothing. A couple of bags of cheap rice or pasta aren't very delicious assole sustenance, but again, better than nothing