Humans are good at adapting, so when events like droughts or floods come along, we look at ways to adapt to that. Some years ago we had a drought here. Now lot

Humans are good at adapting, so when events like droughts or floods come along, we look at ways to adapt to that. Some years ago we had a drought here. Now lots of residential houses have water tanks collecting (at a minimum) rain water. Some are supplemented by ground water, via well points etc. Once you have this, this water is useful in lots of cases. We use it for toilets, watering plants, washing outside spaces and cars, top up the pool, plus other random things like mixing cement or washing the solar panels. When there's too much rain coming off the rook, and the tanks are full, we route the rest into the ground (literally down the well). Our domestic water consumption has dropped around 50%. Although we don't filter it, it "sits" in a tank for several days before being used (and we draw from not-the-bottom) so its pretty clean when we use it. Obviously not drinkable though.