The infected meat theory is interesting. As somebody who has read the comics, I won't say too much on this subject...but my wife (someone who hasn't read the comics was asking me about it), and I told her...the interesting thing is, if the theme is "we're all infected", how much of an effect would eating "tainted meat" even have? I mean...I guess if it was something that made you sick and served as a catalyst in your death, that could be a big deal. But in general...as long as you don't die, you're fine.
Obviously, even for those of us who have read the comic, we don't know when the show is going to just veer off...even in an episode that is pulled almost entirely from the comic. But TO ME, just from what I saw, I thought 100% that Bob had been bitten under the water. If you want to suss out how much time had passed and whether or not he should have died by then, you could be splitting hairs. But for me, his mannerisms made it look pretty apparent that he was hiding something.
And one last thing I'll just throw out there as sort of my own "teaser" for the folks that think Bob is going to die...if he dies, the "meat" will spoil. Let that oen sink in, haha.