I suppose it depends on where you live. If you live in Arizona it might end up being an issue due to the energy cost of processing the water for reuse. However, if you live in Chicago you aren't going to have a shortage of water anytime soon.

I don't really get these water shortage scares people talk about. I can see how it is an issue in remote/poor areas around the world, but a country like the US has nothing to worry about. If fresh water reserves get low we can always desalinate seawater. There are engineering challenges and energy costs to do that, but both are solvable issues. No one is going to die from thirst.