What If the Grid Goes Down?

What if the grid goes down? Have you ever thought about it? America has so many enemies, many of which are capable of very sophisticated cyber attacks that could bring down the grid of utility services that all of us rely upon, and much more. What would you do if the grid went down? Are you prepared for it? It's one thing to have water and canned food set aside, but what if it goes down for a long time? Where do you get water, and how do you treat it so you can actually drink it? I understand there are tablets and other chemicals that can be used, but what do you do when they run out? I am starting to ask these questions because I don't believe most people would be ready to survive in that situation. We are all too far removed from life before all the modern conveniences to even know where to start. So what will you do if the grid goes down?