I would like to add a bathroom fan to the existing end line light switch. I am fine with the switch controlling both the light and fan at the same time as the light only has 14-2 running to the switch and I believe it would need 14-3 or 12-3 if I wanted each of the units to have it's own switch. Correct?? Can I add the exhaust fan onto the existing switch so the switch will turn both the fan and the light on at the same time and if it is possible, how?
The answer to your only stated question is YES. To independently switch 2 different things you need to have 2 switched hot wires, you would have to run an additional wire from the wall switch location to the ceiling location.
The statement that "the light only has 14/2 running to the switch" tells us that one of those wires is a hot lead to the switch, the other is the switched hot that runs back up to the light (unless there are other/more wires that you did not mention).