Sure, socks keep our feet warm and dry, but what else can they do? Socks can help collect and filter water, which, as we've learned, is crucial to survival. Socks won't purify water, but filtering it through fabric can help remove the more visible sediment and creepy-crawlers. And if you've managed to build a fire, you can now boil the water, making it safer to drink.
Pour water through the sock and into a container. (Ladies, you can also use your bra for this step.) Allow the water to settle so any remaining sediment can fall to the bottom of the container. If you happen to have any iodine (perhaps you have access to a first aid kit), use a few drops to purify the water. Add the iodine, and let the solution sit for 30 minutes before drinking it.
Cotton socks can also provide you with a source of fire-starting tinder. Rub or pick off as much lint as you can. The resulting pile of fuzz will quickly catch a spark when you're trying to light a fire.
Read on to see why glasses can be so much better than contacts.