Just grab a tank (20L and 40B are my go to depending on fish size) some big PVC or something for hiding/comfort, a heater (if needed) and a small powerhead or HOB filter. Run your choice of copper supplement, ususally cupramine and or copper blue, and test daily to keep it in an acceptable range. That is about it. I would keep the fish in there for 4-6 weeks minimum to complete the ich cycle.