Simpley clean the
QT and let in air dry a few days and re-set up with newly prepared
SW. Don't use anything from the main as yet for seeding though. I would try to do it as soon as you are able so that when the main tanks fallow period is over, you have a properly cycled
QT making this much easier. You should also be able to start your next fish off in the
QT before tha mains fallow period is over. I would also be sure that you have access to proper meds if needed. Not suggesting you should buy them upfront but at least know where they can be aquired quickly. If nothing locally is available I would then be pro-active and get some Cupramine online along with the multi test copper and Seachem's ammonia alert badge.