If you lose power
I can suggest
get a battery air pump
(we are sold out for right now, try other pet stores or bait shops)
get a clean cylinder trash barrel or 2
fill with water
do frequent partial water changes of the aquarium
with the aged water
open the tank lids
drop the water level a few inches
manually break the water surface occasionally
feed lightly, if at all
clean the filters out
store them damp and clean
particularly canister filters