I'm wondering how common is it to install water tank in a condo's individual unit.

My condo has occasional unplanned water cuts due to main tank/piping/pump issues.

The idea is to install a water tank somewhere inside my unit (like those in landed houses), at least there will be water for emergency purposes.

Is this something feasible to install in condos? I should have yard space for a 250 or 500 litre one, or perhaps a rectangular one above the bathroom false ceiling.

get a tank
get a booster pump
connect to existing piping for easier consumption.
profit

Just put modular tanks. 100-500 litres as u need.

Not common but highly possible. Just need some planning and piping works, it can be done. However, do not expect the same amount of spare water as compared to landed house because of space constraints.
If possible install one at the yard for general use and one each in the bathroom.
These tanks are rectangle in size and range from 20-100 Gallons.

Anyone who actually done this? Wonder how it’s done

Anyone can recommend a contractor who has done this before? Based in Klang Valley. My contacts so far have no experience.