A washer-fluid warning gives you a chance to refill before windshield visibility becomes a problem. Identify the correct reservoir in the manual and use fluid appropriate to the temperatures you expect.
Plain water can freeze in cold conditions. If the warning continues after a proper refill, or the nozzles do not spray, the issue may involve leakage, sensing, or delivery rather than fluid quantity alone.
Tell Oxford Automotive Tire & Repair Sunbury in Sunbury whether the pump can be heard, whether either nozzle works, and whether fluid appears underneath. Avoid repeatedly operating an empty or frozen washer system.