5 Shevat 5776
Previously, we've been advised by our rabbis to keep a two-week supply of essentials on hand. It seems in the case of Planet X - Nibiru also, there is expected to be a one- to two-week warning of its arrival, probably when it is clearly visible in the sky from all points of the globe and can no longer be denied.
This one- to two-week time period is when you will want to be shut inside your house with no need to go outside for anything. You want to already have at least a two-week supply of food, water and medicine on hand to meet your families' needs until the star's arrival. You do NOT want to have to go out and compete with the rest of panicking humanity for dwindling supplies. The streets will be dangerous. People will be going crazy. No doubt martial law will be put into effect at some point. Highways will probably become gridlocked with people trying get somewhere.
After the pole-shift, when conditions on the planet become stable once again, there will be fewer people and you can scavenge for what you need.