Pretty easy, you carry a generator with you. There are many different styles out there. Some heavy some lighter and you need to decide how large you need to go watt wise. I have been using a Polaris 2800 for over 10 years and it has done us VERY well but now with a bigger 5er it is going to be too small. My solution is going to either be 2 Honda EU2000's wired in parallel or 2 champions wired the same. Both are small enough to carry and have enough together to power everything except the second AC all at once.
Chris