Where to top up water in Ford Fiesta?

To top up the water in a Ford Fiesta, locate the coolant reservoir under the hood. It is typically a translucent plastic tank with a cap labeled for coolant or antifreeze. Ensure the engine is cool before removing the cap, then add a 50/50 mix of water and antifreeze if needed, filling it to the "MAX" line. Be sure to securely replace the cap afterward.