The most common reason for the water to taste bad in the reverse osmosis unit would be a filter change is needed
Exhausted filters – replace filters
Unit not used in long time -empty and fill up storage tank twice so water new water moves through RO system
CLOUDY WATER – dissolved air in water. It disappears over time. But you can also Close the tank and open the tap. On a non pumped reverse osmosis system open the bypass valve on the flow restrictor for a few minutes. Then wait till some water flows from the tap. If water flows from the tap then close the tap. Wait till the unit is pressurized (till RO stops). Then open the tank.