Your computer UPS can run a simplel aerator for a significant period of time. There are also battery powered ones in the fishing department of major discount stores: they're used for bait buckets.
And if absolutely all else fails, a squeeze bulb on an airstone line: I kept 3 tanks worth of fish alive by the hand method on a 3 day drive between Maryland and Oklahoma. I never want to do that again, but they got there alive.