Hi,
You don't mention the size of your "kit" so I will start with real small kits.
I still think that size wise there you should go for a Photon LED light as minimum backup. Ihave Photon II's but a recent experience showed me it's not waterproof and when immerged can start lighting by itself and drain the batteries. I read and heard good reports about the new Photon III as to ease of changing batteries and being "fairly" waterproof.
Just go and read about some LED flashlight (from 1 LED up to 19 LED monsters) on Doug Ritters Equiped to Survive site at:
http://www.equipped.org/home.htm
For something larger we've been using almost exclusively 2 sizes of Underwater Kinetics flashlights at our scouting group and they performed extremely well.
We have small 2 AAA cell UKE flashlights they come with clip and splitring and last year I bought about 15 while in the states at a Wal-Mart for $4.99 and NO tax because it was in Oregon

These small lights trow a very good fixed beam brught bundle of light that's a lot better then that of a 2AA cell Maglite.
For something bigger we use the 4 AA cell UKE light and this one shines better then many 2-3 cell big Maglite in my view. Again fixed beam (prefocussed) but very bright.
If you stuff 4 AA lithium cells in it the UKE is very light to pack + you can stick it into a survival pack for years as the lithium cells have a life span of 10 years.
Both and a load more lights can be found everywhere but we prefer to go to Brightguy:
http://www.brightguy.com
You'll find a lot of flashlights at this site.
You'll see that I didn't mention any of the even brighter but more expensive lights using 3V lithium photo batteries from Sure Fire or Streamlight the reason is simple we use the following word at scouting:
BASE = Basic Affordable Survival Equipment
and $50-$100 flashlights don't fit in there.
We've just received some ARC 1 LED flashlights using 1 AAA Alkaline batterie and although the Turquoise one has vissible rings it hrows out a lot of light and still remains fairly small. The white one is smooth but produces less light then my white Photon II.
Still we love the lights because they use cheap AAA alkaline batteries that cost us 6 times less then the 3 V lithium CR2016 coin cells, you see we apply again the BASE principle.
Good luck finding your ideal survival lights,
Best regards from Holland,
Bagheera