My recommendation would be for you to study history. Find out how people lived 100, 200, 1000's of years ago.
Your going to want to find out how to..
Build a permanent shelter - The lean-to is gona get old FAST. Especially if you have children.
Dig a well - Water purification tablets/filters will not last forever, and boiling water all the time is going to use up resources.
Food prepration/harvest/storage - Nuts and berries will also get old fast, and you need to think about winter (or summer if you live someplace hot)
when pickins get slim.
A good overview of this type of stuff can be found in books like Storey's Basic
Country Skills - A Practical Guide to Self-Reliance
covers a lot of the basics of living. The
are also good if a little lacking on exact step by step guides.
You might also think about what skills you have, in other words what will be your job?. Imagine it's a year after whatever happened and you come
across someone offering a loaf of bread (you haven't even seen one in a year and it sure looks good, look your even drooling!) What service/items
could you offer in trade? If you can't think of anything off hand it would be worthwile to read some books on a subject you find interesting.Things
like blacksmithing, pottery, baskets, leather, preserved foods, shelter building, clothing, well digging and on and on...
Surviving the event is only the first step, you also need to live and thrive.