“Charging extra doesn’t mean more people get water”
A demand that generates profit will attract supply. If someone finds the potential gain sufficient, they will bring more water to the area. The resulting competition will further effect the unit cost.
The same goes for generators or fuel.
There’s no supply to attract. That’s part of why they get to charge extra, there’s a natural disaster, they’re cut off, replacement supplies are NOT on the way. As soon as the supply lines are open again then the prices have to go back to normal because they’re no longer cut off.