Anon there is a book called "A Failure of Civility" that goes over how to secure your area in the event of SHTF. It is a very good source. However it is very hard to find now.
Auguson Farms and Patriot Supply are a of good websites for emergency supplies. You can buy a 5 gallon bucket water filtration system for about $150 that will clean 6000 to 12000 gallons of water FOR DRINKING. Also good sales on emergency supplies. You can buy large bags of rice and beans at Sam's Club for just a little money. Get a gas grill with a side burner…keep a extra can of propane for emergencies. Just some little suggestions.