>>16631when it comes to food some basics
1:if it's in separate packaging check for rips/holes that sort of thing, and check dates.
2: raw foods, often the rule of thumb is to not eat without washing them, and giving them a once over e.g check for mold, bruising, other signs of rot.
that is if you are worried about
3: common sense is king, things like meat (unless highly preserved) just don't even bother.
on a side note diving purely for food can be done with ease in the daytime, and when confronted will often just be told to leave or you may sit in the back of a cop car as a scare tactic. just be aware of local laws, and like i said common sense is king DONT BE STUPID, STUPID!