Mike,
Glad to read that Connie and your dad are fine.
As for the CPAP machine power supply, there's a number of backup power supplies, both battery and AC out there for sale. Also one should plug in their medical device power supply into a dedicated, UL approved, name brand surge protector for added protection.
A program that many are not aware of. Many electrical utility companies across the USA have a program for individuals that require dedicated medical devices (CPAP qualifies). The utility will provide for or pay for critical care battery or generator backup for such medical devices so one can still operate their medical equipment during a power outage. Check it out and sign up.
Wayne