I have two different PSKs, one for urban environments and the second for my wilderness trips. The urban kit contains things like a lighter, whistle, safety pins, sewing needles, dental floss, bandaids, some meds, duct tape and a flashlight. It does not contain anything to eat or purify water. Separate from this urban kit I always carry a leatherman (wave or kick), SAK Traveller, and on my keychain is a whistle, LED flashlight and a P-38. This kit is designed to a) take care of small "emergencies" such as fixing a tear in DD's goody bag, or a minor burn and b)help me make it home if something happens while I'm away from the house. I'm not too concerned about finding water in this urban/suburban environment.

My wilderness kit is only slightly larger. It contains things like a spare compass, three different fire-starters (storm matches, bic lighter and mag bar), a Heatsheet, some rope, signal mirror, water purification tabs, another whistle and a small Gerber lockback knife. This PSK is designed for me to shelter myself and signal for help in case I get lost/hurt in the woods.

Currently I carry a separate, large first aid kit in my wilderness backpack but no 1st aid stuff in my wilderness PSK. This thread is making me rethink that though. I might add a roll of guaze and some sewing needles (not to suture but to patch torn clothes).

-Blast

p.s. I should also mention that both our cars have BOBs which include clothing, shelter, water, tools, data, etc...