Quiding is explaining his clickbars and how-to set them up, which is pretty much what you want regarding food and stuff:
https://www.youtube.com/watch?v=N5-lxRdKi90
Regarding single target buffing:
The easiest way is to simply use the ISboxer assist, followed by an executed macro (either ISboxer or in-game) to cast the buff, while the buff-step is round-robin.
So you just have to target w/e you want to buff and hit the key (works also for non-grouped or non-team players).
Something like this:
=>
If you want to do it via clickbar (I won't recommend it for buffs, unless you want it static and to only work for your own team), simply setup a clickbar and as action refer to the mapped key.
Cheers
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