Sorry ginting, but water destroys the fuel injection systems in a common rail diesel engine.
Both visible and microscopic, ie dissolved water within the fuel, should be eliminated so the injection system will have along life. The diesel engine itself may not worry too much for very small amounts, a drop of water, but if hydraulic lock up happens then the engine too is history.
Filtering which catches any visible water AND filters which collect dissolved water held within the fuel are best to have on a CRD engine.