My first choice would be just to fill the bottle with water,put a metal cup over it and carry a PSK seperately. Would a kit with the bulk of a 1l. nalgene still be a PSK?? hmmm...

Anyway, this is what I'dd put in there:

-Metal cup over the nalgene
-about 2m. of duct-tape wrapped on the bottle
-knife,SAK of something alike
-3m. paracord
-photon II microlight
-10 water-purifying tabs
-10 wind/waterproof matches
-chap-stick
-energy bar
-AMK heatsheet
-AMK Pocket Survival Pak or similair contents
-mesh drawstring-bag for putting in the contents when using the nalgene

As you can see, no FAK-supplies. Maybe a bandanna would fit to?

This is a link I found when googling: http://www.tadgear.com/x-treme%20gear/tad_gear_bug_out_bottle.htm