Hey urban explorers of /out/

i want to go exploring on friday evening/night. This will be the first time doing it alone and im not sure what i shoud take with me.
This is what im thinking about.
clothes:
normal t-shirt
old pair of jeans
black boots
light jacket

equipment:
a flashlight with spare batteries
pocket knife or maybe a hunting knife
cellphone (charged of course)
a pack of cigarettes
1.5l of water
something to eat (what should i bring?)
a camera (pocket cam or full sized cam?)
my point of doing this arent the photos i just need some space from home, family and friends so a little adventure seemed right for me.

additional infos:
im going to the object with public transportation and im planning on a 4-6 hour trip.
so my question is:
did i forget anything important? any other tips while exploring alone?

bump with pics from the last time