I've only scanned the responses to your post so I may be repeating what someone else already said but here is my advice:

1. Keep a high-quality multitool on you at all times.

2. Learn to improvise. An urban environment is filled with stuff that can be turned nto shelter, carry water or lit on fire. During your daily travels look around and imagine what you could do with the stuff you see around you. Wildman has a good thread on doing this from several years ago.

-Blast