1DC, I did the same once and had the same service. I did NOT expect or want to interrupt cc on their break just because I wanted some water. Some of us (pax) do appreciate the work cc do and try not to cause inconvenience.
As an aside, I find +7hr sectors really boring and travelling alone with a snoring person in the next seat, I often find myself at the back of the cabin looking out of the window trying to keep out of the way and pass the time (I can never sleep in economy/cattle and my budget prohibits any other class). My question is this ... do cc mind if pax engage them in conversation (NO - not trying to pick them up). Obviously if you're clearly engaged in activity - trolley, meal preperation etc then the answer would obviously be no.
Just curious and trying to avoid causing (further) offence.