Why You Shouldn't Make Your Apocalypse Preparations Based On What You Read In Fiction:
Well water requires a pump. A pump requires electricity. When the apocalypse comes and the power goes out forever, the pump will fail, and your house will not have water. "Our house has well water" does not automatically solve the problem of where you will get your water during the apocalypse (although in this book, it does).
If you want water in your house, you would have to rig up some kind of hand pump instead. Then we're talking about hauling buckets of water up from the basement, not opening the kitchen faucet and having the water pour out.
Bonus: often well water contains too much iron or sulfur or bacteria; people buy various machinery to clean it up. Any of those that require electricity will fail, too. Your water will taste funny, and if the well is contaminated you might get sick. These are also things you would have to either find a manual fix for or live(/die) with.
That's about all I have to say about this book. I didn't like it, but this is the only thing worth really bitching about.