I have ever only tracked one car without power brakes and hated it. It was a thunder roadster and it was set up right, but it had a wide brake pedal because it damn well needed it. The manual brakes were one of the reasons I didn’t buy the car.
So a lot of other people have made good suggestions, but if I had a car that I routinely let sit for a couple of weeks at a time I would put a battery maintainer on it for while I was gone. Lots of good cheap ones out there.
Drive your own car. I’m not up to date on Malibus, but you are getting close to needing some routine maintenance. Water pump, timing belt, transmission fluid change. Stuff like that although maybe not exactly that. Talk to your mechanic about stuff like that. I want to be clear this is stuff that is going to need to be done soon if you take the trip in your car or not. Go ahead and get that kind of stuff taken care of then drive your car.