No offense, but this doesn't sound that bad.

1.) Water in washroom: agree this sucks, but I doubt it's a cost-cutting conspiracy. Probably more like a mistake.
2.) I don't see an issue with re-filling the water bottle, I've had them do it for me before as well. Maybe the plane wasn't stocked properly that day, or maybe the FA thought she was being environmentally friendly. But either way I also don't think this is a cost-cutting conspiracy, probably just a mistake loading the plane I got 3 water bottles in F (which was totally full, as well as J) last week.
3.) Food is definitely not a strong suit for CX, but again I don't see this as the end of the world - I was just on F in BA a few days ago, and was reminded that menu offerings are simply more spartan than they were 2 years ago. Oh well. Sign of the times. Personal opinion here, but at the end of the day it is still airplane food regardless and I'm never really big on the main courses, F or not.

Re: hanging out in F w/o a ticket, I'm 100% opposed to that. Go back to J and see them there. Lights are on longer in J and it's louder. Many people have paid a lot (or redeemed a lot of of miles) to have a more exclusive/quiet/peaceful experience in F, and it always bugs me when someone tries to come in the cabin. Trust me, I've seen it happen a handful of times and each time the person who does it is completely convinced they should be allowed to say hi, hang out for a minute or two, check up on someone, whatever, and without fail the FAs always send people back promptly. I appreciate it that they do.