Say a hurricane comes through in October and takes the power with it. Not for a day. For two or three weeks.
Walk through what that actually looks like.
Day one is fine. You've got what's in the fridge and whatever you grabbed at the store.
Day three, the jugs are down to one. The stores are closed or picked clean, and the roads to the next town over are flooded.
Day five, nobody's had a real wash. There're dishes in the sink you can't run water over. Your youngest is asking for a bath.
And the whole time, there's water everywhere. It's in the rain barrel. It's standing in the yard. It's in the creek behind the house and the pond at the end of the street.
You just can't drink any of it.
That's the actual emergency, not no water.
Unsafe water, everywhere you look.
Now run the same week, but now you have a small emergency water straw filter in a drawer.
You walk out with a bottle, fill it from the rain barrel or the creek, thread the straw on, squeeze, and you've got clean water in a pitcher. You do it again for the dishes. Again for washing up.
Same storm. Same three weeks. Same standing water in the yard.
The only thing that changed is that now you can use it.