i use black storage totes for qt sometimes, should be easy in a pinch. any heavy duty tub from home depot or lowes should work. or just go get a 10g tank from petco
you'd just need to aerate the water in some way, small powerhead or airstone
a heater (or not idk how cold it's getting in paramount right now) the ones from petco are small and cheap
some biomedia
a bottle of biospira
what's wrong with your fish?