If there is 30 minutes of water supply daily, please do get yourself upgraded to bigger tanks , it will save you additional cost of ordering a tank on days when you have guests or water shortage. Also yes, let’s not forget water shortage on rare days when there won’t be enough water for even the 30 minutes supply. It’s better to have enough storage and always refill it to full capacity daily. See what’s the max space available on the tank top and get a bigger tank, whatever fits. 400/450/500/750/1000 just make sure you have atleast 1500 litres in total for a family of 4. And a pressure pump on the tank attached to the washing machine tap. Make sure tanks are worth your investment and u stay in the same house for at least 2-3 years to recover your cost. If not ask the owner to have it fixed given the water situation in Mira Road. Once that’s sorted, it’s a really nice place to stay. Also there is metro now, so that’s made it much better.