If you really, really HAVE to have AC power get an inverter and run it off a deep cycle battery. Be aware that some sensitive electronics won’t run off of some modified sine wave inverters. Which happen to be the cheapest inverter option available. A pure sine wave inverter will run everything, but the price is almost double the MSW in most cases.
For just DC needs like charging phones and devices, I use my jump start pack from Harbor Freight.
This jump pack keeps phones and iPads charged on week long trips to the Canadian arctic. We went 7 days charging iPads and phones every day with this pack.
And a jump starter pack is a damn handy thing to have anyway. I never regret spending money on tools, I’ve used this pack several times for jump starting or in a pinch a boat will outright run off of the pack alone.
Grouse