I think my betta fish is sick, I found your forums after doing a google search for fish care, I've read through some of the posts here about sick fish, and I don't know what to do exactly yet.
My betta fish, Professor Chaos, has lost color all over and the area under his mouth to his front fins has turned gray. He seems to lurk at the bottom of the bowl, hiding in his fake plant more than he used to. He does come out and swim around to get air, but he stays at the bottom the rest of the time unless I wave my fingers near the bowl.
I live in a college dormitory, and am not allowed to have an aquarium, so he lives in a bowl, I don't know how big but I have a picture (from before he was sick).

I don't heat the bowl because the radiators in my building are always on, and it's extremely hot here in the winter. I also don't know if I can heat such a small bowl anyways. I've been buying bottled spring water for his bowl, but I haven't put anything other than water in it.I change the water about every 1 and 1/2 weeks. I've been feeding him about 6 pellets a day of hikari betta gold, 2 pellets at a time. When I called Petco they said that I should put dechlorination stuff in the water, even though I'm using bottled. Could that be the culprit?