Brother Just Won Goldfish. Help

My younger brother and I were at a local carnival and I let him play some of the games while I went on a ride. When we met back up, he had a bag of water in his hands and I knew that he had just won a feeder goldfish. I currently do not have the money to afford even a betta tank setup since I recently set up a new 10 gallon. I don't want to let the thing die as it looks very healthy for a carnival goldfish.
Any suggestions for a makeshift tank? If I can find something that he can live comfortably in for at least a few months, I can put him in a 90 gallon living room fish tank when we purchase it. Would a bowl be ok to start? a 5 gallon tank?

 

Do you have an unused, clean, large storage container? You can always use one of those but if you don't have one, you can also buy a new one for really cheap but the main problem is getting it cycled :/

And yes get a sponge filter, they are cheap and effective

 

Go to Walmart and buy one of the large plastic bins for a few dollars.

They hold between 15-40 gallons, and with a cheap hob/sponge filter, would be adequate for a few months.

Just keep up with your WC's!

 

Single tail goldfish need 150 gallons when fully grown but really a large pond. Since he's young I would recommend a 20 long minimum. You'll need extremely good filtration and very regular large water changes. Definitely not a bowl.
Also goldfish are social so he would appreciate a friend.

 

You could buy a storage bin and but in a sponge filter

 

Go to Walmart and buy one of the large plastic bins for a few dollars.

They hold between 15-40 gallons, and with a cheap hob/sponge filter, would be adequate for a few months.

Just keep up with your WC's!

I am pretty good with maintenance. I can easily buy a large storage container and make or buy a spongefilter as well. Thanks.

 

You beat me to it that's what I was going to say