General guidelines – for urban survival: Keep your preparations secret. Do not brag to neighbors, friends, etc. Know your neighbors; be friendly Avoid attracting attention to yourself, but watch for like-minded people with whom you can ally.
Know the location of your local water sources; for example, fountains, ponds, streams and reservoirs. In apartment buildings, the water systems including piping, water heaters and toilet tanks can hold a substantial amount of water. In multi-story buildings, there are large volumes of water in the fire sprinkler systems. In cold climates, some fire sprinkler systems contain anti-freeze. If you live in a multi story apartment building, become familiar with the building utilities, particularly the water and sewer systems.
Do not run generators or show light at night. If you have lights, put up blackout curtains. You can improvise them from blankets or other heavy materials. Noise from generators will attract attention. There is a saying in the military, “If I can find your MRE (Meals Ready to Eat) trash, I can find your base”. This also applies if your neighbor sees your trash. He knows what you are eating. What are you doing with your trash? Can your neighbors see where you are throwing your food wrappers? Burn your paper waste and bury what is noncombustible. Can your neighbor smell your food cooking?
Know the parks in your area and vacant lots. There will be a surprising amount of wild food available. Remember that pigeons are edible, and not hard to catch.
Know the best routes out of your nieghborhood, in case you have to bug out.