a batery aerator will do good if nothing else is availible. it will make you last with fish for quite a while depending on the type of aerator and the size of your tank. Corals however though, wont have as good as a chance
you can also go in there with a giant spoon every once in a while and try to move things around a little.
back before i turned to SW, i had a 10 gallon freshwater tank. Well up here in CT we had an ice storm and the power went our for 3 days. They were tropical fish so they couldnt get cold. So i put them in a big boiling pan, like a lobster pot, but them by the fire place, but not too close (because i didnt want fish for dinner), and stirs the water all the time. They made it, but then again freshwater fish compared to saltwater fish. Get a bunch of airstones. good luck.