You can try salt for the fungus before you spend the money on the other items mentioned. Salt is the oldest remedy fish keepers have, but it is still a very useful one, both for aiding to heal wounds and sometimes for fungal problems that are secondary to the wounds.
It is best not to use table salt, as the additives may not be so good for fish, though I've read arguments that make sense that say it is fine too. But most recommend fresh water aquarium salt, or Kosher salt, pickling salt or even sea salt. You add salt to water you plan to add as part of the water change, making sure it is dissolved totally first. No crystals lying on the bottom.
Approximately 5 grams per litre of water. 5 grams is about a level teaspoon, and there are about four litres in a US gallon. It need not be precise at this dosage. Much higher dosage is used to treat things like Ich parasites, and then you do want to be pretty careful with dose.
It may very well clear things up in just a few days. Fish are often remarkably resilient.
And the warnings we all are saying are just because we know how fast these fish can grow. We also know how attached you can get, to any pet, wet or dry, it doesn't matter. If you care for him well, the sad fact is he is capable of outgrowing that tank before you get finish your second year.
If you are near a lake, chances are the water is pretty hard and alkaline and that's fine for a goldfish. Testing will tell you for sure, but that seems likely. What state is your college located in ?
I never said anything about getting rid of him! 
