We already have two 5000 liter tanks underground. Running out of space and would be limited to a 500/600 liter one. We need more of a buffer than that.
Currently checking Lazada for a small 50 watt pump to help the municipal water along. They are indeed popular judging by the many many reviews these mini-pumps have. Maybe that's what's causing the low pressure in the first place, everyone boosting the city water supply.