you can check if they will permit you to install a small tinaco on the balcony (if you have one).
I'll move before I do that. I'm on the top floor so installing one on the roof would be great, but can the buliding hold every apartment having one? Also this points out the issue of all these buildings going up and the old city water lines. I was told the water that comes from the street is not enough to fill the cistern. And there are more people living here compared to last year. Com'on rain.