2003 Dodge Intrepid water

You either need to be more diligent in looking or get a pressure tester.

The pressure tester puts pressure on a system and replicates the system pressure when the system is at operating temperature.

You may be able to find it without it of course.
I would start focusing on the areas near anything that is hot and would cause coolant to burn off quickly. Look carefully for stains from prior leaks or current leak. Use mirrors and good lighting to look with. Be sure the system is always full.

Sometimes a leak may be present when hot or when cold. Try starting it and running it for a very short time and see if any leakage occurs. Try it idling at operating temp while you look.

Post pics if you like or post back.