As I said in another thread (or maybe it was this one, I don’t know anymore), down here in south Florida, if the power goes out, the water treatment plant can’t operate. No one has any running water. It’s all well and good to say “fill up the jugs in your house with tap water”, but if you’re evacuating to a shelter or to a friend’s house outside the evacuation zone, that’s just not practical. And even if you’re staying in your own house, all those jugs you filled up don’t last very long. You have to drink, you have to cook (boil water on the grill for pasta or coffee or whatever), you have to brush your teeth and wash your hair and wring out a wet cloth to put around your neck while you swelter because you have no A/C. Power can be out for weeks. You need to stockpile water in whatever way you can.
I’m in the evacuation zone and when my power goes out in a storm, it has taken 3 weeks to get it back. I will be leaving the house tomorrow or Saturday and returning as soon as it’s safe but we will need a lot of water. Thankfully, we can use the pool water to flush the toilets.