On page 11 of thread 1, there is a link to the barber shop CCTV footage, the last known siting of him at 19.41 where I think he looks drunk, many people on that thread also appeared to think so. There is a lighter version of that very same video where it looks much clearer and people were speculating that it looked like he had stepped out of a doorway further back. You can also see him holding his phone in his hand. I'm sure that lighter version of the video is about somewhere, I haven't had the chance to hunt for it properly yet.
We don't know he actually turned his phone off - he could of dropped it in a puddle and it broke, hence why he's holding it in that video. We don't know that he didn't tell anyone he was leaving - I haven't seen any exact details given from statements of the group to say what the circumstances of him leaving actually we're. Hence the speculation back along.
He was not 'nowhere near' the river, as I said before, from his last confirmed siting on the CCTV referred to above, he was just a five minute walk or so away. All he'd need to do was turn left and keep going.
People keep referring to this later footage at 20.45 which I believe has been ruled out by family and police as being him. No offence at all but Anthony was not a particularly distinctive looking person, there were probably lots of guys out similarly dressed with similar haircuts that night. We only know Anthony from photos and videos. His loved ones saw and spoke to him everyday, if they have looked at that footage and said it's not him I'd believe them. They, of all people, would be the ones who'd want to make sure they got it right while desperately trying to find him, surely.
I personally would describe drinking from early afternoon to evening as "drinking all day" but I guess that's a subjective opinion.
I don't think you need to be falling down drunk necessarily to have an accident around a river swollen by flooding with no railings around it in the dark.