At least for WN - it looks good
I've only been on WN since the water ban, but I have ask for a beverage and a can of spring water and gotten it with no attitude. I saw other passengers doing likewise - again with no problems. I have to imagine that the airlines are ready for this - but I have not gone on any really long flights. That will be a big challenge.
I'm going to Fiji in Oct -- I hope this nonsense has subsided by then.
--Sioux