When you buy the deposit, make sure it is the appropriate size and that it is plastic or acrylic. Those that are of another material can contaminate the water and in the long run would be harmful to the health of the user.
The other alternative you have is to install a hydropneumatic or suction pump. The first drives the water that leaves the cistern to the apartment. With proper maintenance, it can last more than ten years. It is recommended to install it at the water outlet of the tank. While the suction should be fixed in the water outlet of the elevated tank so that there is a proper distribution of the liquid element.
It is very important that the engine is cleaned every six months to avoid problems over time.