You can bring your CPAP as a carry on device, but are required to provide your own battery power source. It must be on this approved devices list: https://www.delta.com/us/en/accessib...ces-medication

The aircraft will likely have 110V power outlets, but Delta explicitly says they are not for medical devices- partly because they are not designed to power motors, and partly because they don’t want liability if they stop working or are inoperable during the flight. You will need to bring your own distilled water if bottled/tap is insufficient - this would become a TSA exception you would request for medical purposes.

Many will report that they surreptitiously (or openly) power their CPAP from the aircraft anyway, and this may be something the flight crew permits on your flight. By the text of the rules, however, powering it for 150% of the flight duration is your responsibility.