pPrune Towers...
<<As many of you are aware on low cost favourite airframes no air means no running water. Food is being handled, set up and stored. Calls of nature attended to and absolutely no facilities for the crew handling the food to wash their hands.>>
Our A320s/A319s are the same... well at least the new ones are. The 10 old ones have air compressors to keep water flowing whenever power is on... And as you say, under pressure from airports / employer to minimise APU use, asked not to start it until ETD - 5 or so. And that's after all the food has been setup, distributed, everyone's used the toilet, can't wash hands etc.
Oh - and as my "handle" shows, we're not a LCC!
NoD