I found the answer!

I never needed to mess with paths at all. All I needed to do was place my filenames in quotes instead of in brackets like so,...

Code:
// System includes:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// My special project includes:
#include "myfile.h"
#include "myfile.c"
As long as these files are in my working directory I don't need a path. And if I want to put them in a sub directory I only need to add the name of that single directory as long as it's inside the working directory.

This is what I wanted.

It all about just using quotes instead of brackets in the include statement. No need to mess with defining the paths as long as these files are in the working directory of the current project, which in my case they are.