I built a local storage for 1000 liters with a pump, which is enough for several days, but it slightly reduces water quality and needs to be regularly maintained. It's not ideal but it works for me.

It's not that there isn't enough water, in my case there would be enough drinking water if farmers didn't use it to water their fields. Ideally they should make wells for farming and keep the public drinking water separate but in reality they just turn the municipal tap on and go to town with watering. And I don't necessarily blame them, they got used to that when it wasn't a problem 10+ years ago, but now there just isn't enough water in the system for that.

It's not a problem that can be solved with individual action, it requires massive infrastructural investment and a top down restructuring of everything, including how we even think about water. The current system is built on a premise of water abundance which just isn't a reality (anymore), we need a completely new framework.