I just won a fish from a fair and i have some basic questions?

I just won a little (what i assume is a goldfish) fish from the fair in my town.It's name is Sid by the way. (: I was wondering a couple things:

what kind of food should i get it?
any specific tank? does it need a filter? etc
should i put another fish in with it?

and i know you guys are going to like: it'll be dead in a week. But i have a lot of faith in Sid! haha

any other tips you have PLEASE tell me. haha i want to proove my friends wrong!
oh, also! should i put tap water in the tank or bottled water?
 
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