While I think there is something to be said for having enough food and water on hand in case something were to happen, I also think that we can do a lot to make sure our homes are spiritually prepared. For instance, when was the last time you had your house blessed? We had a priest friend over for dinner a few weeks ago and he did an incredibly thorough house blessing - I mean thorough! into closets and everything.
If you've never had your home and family consecrated to the Sacred Heart of Jesus, now might be a good time to find a priest willing to conduct the short but beautiful service.
What about getting a hold of some blessed salt and sprinkling it around the perimeter of your property? You could pray the rosary as you walked your property line and sprinkled the salt.
We've also read about how it is a good idea to bury a Miraculous Medal and a St. Benedict Medal at each of the four corners of your property. You could make that part of the blessed salt sprinkling and at each of the four corners recite this prayer:
Through the power of Our Lord Jesus Christ, we consecrate this house and property to the Sacred Heart of Jesus and to the Immaculate Heart of Mary. We command you satan to leave this ground that all here may be Holy. We bless this property in the name of the Father, and of the Son and of the Holy Spirit. Amen.
Do you have a crucifix over each of the doors to your home? If not, you can pick up some small, inexpensive ones and tack them right up there. Also, if you have some holy water available, it is a good idea to use it often.
Just thought I'd share with you some of the things we've found out about and done in our home. Even if nothing bad happens, it sure won't hurt to have such hallowed ground to live on!