
Are you joking? There are hundreds of different ways to get water to them. If you move any physical resources into a place, chances are high you can move water in the same way.
There’s also just building pipelines and extra desalination plants along the coasts or some more exotic methods of water extraction from the air or earth depending on how you want to do things.
Point is that we have the technology to produce as much fresh water as we could probably ever have a desire for. Fresh water is an extensible resource. And as long as we have vehicles, we can get that water to the people who need it (though pipelines would be more efficient).
So why does it seem like water is scarce if it isn’t? Because it requires infrastructure to produce, and—while building that infrastructure is very possible and not difficult at all for a developed country—few countries would pay to save the lives of the less fortunate unless it benefited them economically.
In other words, the scarcity you mention only exists due to the greed and selfishness of those with economic resources. Overpopulation isn’t the issue, economic systems that value money/revenue over the lives of others (capitalism) are the issue.
Edit: Also, the rivers running dry is mostly an issue with wasted water and allocation of that water (as the commenter above mentioned). Both of which would be drastically decreased if profit wasn’t controlling their regulation more than preservation or societal benefit.








A quick Google search pulled this up: Growing Living Rat Neurons to play… DOOM?