Reddit mentions of Stren Original Line Filler Spool, Clear/Blue Fluorescent, 20 lb, 330 Yards, 302m, 9.1kg

Hoboy. Got a couple that I've tried and used in emergency situations.

First, you need a knife. No matter what. I recommend the Gerber Gator. Mine has been holding strong for the last 8 years, and I always keep it in my pocket, unless I'm flying somewhere. Holds a serious edge, no matter how you abuse it.

Water is a big deal. I have these stashed in my BOB, my car, and a couple floating around the house. Used one on a camping trip, drank boiled water from a murky stream, water tasted delicious and I didn't get any bugs from it, so there you go.

Flashlights are important. This is where you might scoff: The best handheld lights I've purchased are, hands down, these cheap things from the 99 Cent Only stores. We used them during the big blackout of 2010 here in Dallas, aka the Snowpocalypse. My house was without power for 5 days. Hand-cranked, bright as hell, durable, and cost a buck each. Amazing little lights. I went out and bought 10 more of them after that. They're now in every room of the house, and I have given them to friends as gifts.

Aside from flashlights, we used a Coleman Rechargeable in the main living room as well. I sing the praises of this light all the time, and show it off to friends. Comes with both a wall charger, and a car charger. Both chargers tuck into the base for easy storage. This light, on the low setting, is rated for 10 hours, but we used it for 14 hours one night without draining the battery. Low is good enough to read by. High Setting, however, is literally painful to look at directly. If you need it, this lamp can get amazingly BRIGHT, impressively so when you realize it only has one LED bulb. During the blackout, we charged it during the day in my car. Great investment.

Tying materials are damned important, says this guy who loves bushcraft and has seen a couple of disasters firsthand. Get you the following:

• Paracord
  
• 20# test fishing line
  
• Heavy duty cotton thread
  
  They're inexpensive, and if you ever need them, YOU WILL be happy to have them on hand.
  
  Get thee to an Army/Navy Surplus and buy a shit-ton of cheap P38 can openers. Fuck buying them online, unless it's bulk - my Surplus store sells them at $.20 a pop, or 6 for a dollar. I always keep one on my keychain. They're absolutely invaluable.
  
  A good DC inverter for 12v car sockets turns any car into an instant, medium-powered generator. I keep one in my car, as does my wife.
  
  Buy a handcuff key and keep it on your keychain, along with a mini LED light and a P38. Never know when you might have to use it.
  
  FIREMAKING TOOLS ARE A MUST. Bic lighters, Magnesium/striker fire blocks, waterproof matches, hell, I once started a campfire with a magnifying glass. Keep fire tools handy and ready.
  
  Aside from all that, I can only note the following: Lightsticks, a first aid kit, bottled water, a machete, a good length of proper boat anchor rope, blah blah, normal survival shit.