We had a hurricane hit hard a few years back, I ended up borrowing a generator by the third day. But before that I was using my 12 volt power inverter to run the power heads. Works for me however it was hot outside and inside my house, so I did not need a heater. Some times Walmart sells them, good luck with whatever you do.
Ps academy has battery operated air pumps for 5gal buckets for the bait fish u bring with you, you could get some and run them for oxygen