Add aeration and full filtration. If any live animals can stay in their temporary quarters overnight, that is best. Aerate the water overnight before adding animals back. Watch them for distress. Now, you have essentially a new tank.
People often ask what to do about their fish and aquaria while on vacation.
If you are gone less than a week, you need not do anything. Simply do routine maintenance and do not feed while gone. If gone for a week or more, you should change the water and vacuum the day before leaving. Change however much water you normally change, between 10 and 50 percent. Be sure to add additives.