The big questions we need to have answered are...

Where are you?
What is likely to bite you?
How long is it likely to keep biting?
What are you going to do when it bites?
What are your skills?
What are the skills of your spouse and kids?
How old are the kids?
Are there any special needs to keep in mind?
What do you already have?

If you already have good clothing, that's a big part of it. The rest of it really isn't super expensive. I ran my roommate through what makes up 72 hours of food and basics this afternoon, and other than a knife (she has a couple of them already) and cigs it could be done for under 50 bucks. *shrugs*