For a inexpensive easy to carry blanket I would get a space blanket or three.
If you are worried, I know there are inexpensive kits readily available that have three days of rations and water in them.
http://www.safetycentral.com/safetycentral/arkiiipersur.html
http://www.safetycentral.com/safetycentral/grunemamradf.html
etc.
One more:
http://www.safetycentral.com/safetycentral/solmodf6.html
BTW, I DO NOT have stock in this company. LOL!
All of this is valuable input. Someone ought to catalog and document it. Everyone ought to know stuff like this.
Thanks for those links, RA. Preparation is good insurance.