bill wrote:

On a recent trip I bought a bottle of XO Cognac
I saved a few of the (drink bottles) we had for breakfast and
filled six of them with the remaining alcohol.
because each bottle was 100ml in size I was allowed to
take them all on board the aircraft.

You are a deeply sad person.

How so?

I do the same thing. I save empty 50 ml bottles of liquor and re-fill
them at home and bring them with me when I fly. Sometimes 4 of them at
a time. I always get them past screening with no questions or issues.