If you can get a 10 gallon tank use it as a qt tank you might be able to keep then ammonia down with water changes. Keep it bare bottom and if you want to put anything in it maybe just one live rock or a piece of pvc
. Test the water at least once a day and always have at 5 gallons of water mixed up and on hand for a quick water change if the ammonia gets high. One of those wally world 10 gallon kits is all you need the filter isn't the greatest but it will provide water movement. They also have those little cheap power heads you can use.
It is always a good idea to have a qt tank that you can use as a hospital tank anyway.