Long time user of CPAP and travel plenty include our 3 week RTW trip on 9 different airlines.

I ALWAYS take my CPAP with me. Never an issue. Goes in our carryon, and no longer use separate bag/container.

Also, figured out I could skip the water part which cuts down on the size issue. Just remove it. Try it at home first to see how you do.

As to distilled water - it is NOT REQUIRED, just better. When I was using it all the time, I would often just use tap water when in a hotel. The distilled cuts down on residue in the tank. Regular bottled water would be a step up and closer to distilled. The whole distilled thing is overkill.

As to travel vs home - I use the same full size when traveling and we only do carryon.

Power - most are dual voltage - hence the power brick - just need an adapter and NOT a converter.

As to power plugs - earlier posters are right that you are supposed to use your own power, but nobody would stop you. Though I use my CPAP 99.5% of the time at home in the 10+ years, I usually opt to not bother on the plane. Have done it a few times, but usually just do not bother, even on long flights with lay flat beds.