Finicky cat? I wish!
My 4 year old female cat, Ember, has rarely met a food she does not like. The kitchen counter is off limits but she is all feline when it comes to fast and sneaky.
While I focus on what I am doing, she sneaks unseen into a dark corner of the counter to make a quick grab and getaway. She has snatched walnuts, sunflower seeds, pecans, toast, a muffin, etc. She once plunged her whole face into a mixing bowl of flour. I have caught her licking the outside of a canola oil bottle.
I have raised several cats over the years. They learned to stay off the counter (at least while I was home) and not to snatch food. But Ember is incorrigible despite my resorting to spray bottles. She has broken 2 spray bottles by tossing them to the floor when she saw them on the counter without me.
She knocks margarine to the floor so the lid pops off, then helps herself. Of course then I have to throw it out so she has taught me to put it away immediately after using.
Ember has perfected the skill of knowing when I am distracted and vulnerable to a sneak food grab. So I am on the laptop and absent-mindedly put a potato chip to my mouth.. Poof! Faster than lightning she grsbs it and runs. I chase her down to grab it back so she does not benefit from her theft, but that does not deter her from the next time.
I have also seen her walk across my desk and stick her tongue into my bottled water as she passes, without missing a beat. Now I use snap lids to close after I sip. (But how many times did she do that before I caught her?)
She is not underfed. She has cat snacks besides her regular cat food, snd kitty grass to nibble on. But now when I cook or prepare food, Ember gets put into a room with the door closed until I finish.
I think she enjoys the challenge as an outlet for an indoor cat's hunting instinct. Is that possible?
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You guessed it - he loved that brand of food. He would go crazy if there was a pork roast made too I always wondered if the ham , pork and bacon he got would hurt him but he lived 18 healthy years
All the other cats in my life never gave even a look to such things as a ham sandwich on a plate but another one , who also lived a long life , did sip beer if it was left out in a glass .
Not water, but if it was beer, she would be found trying to get a nip 
I have to stop laughing first, sorry. 
What she wants is attention. And she gets it when you respond to a theft or slight. And it's also a game of chase, which cats need, that predator aspect is probably what you notice but it could be a hunt thing. Cats like to play chase, though.
She sure has you trained! Nothing against you but she has learned to push your buttons. Animals are smart and when they find something meets their needs, they will use it until it doesn't work anymore. She wants you to spend more time paying attention, playing. Nobody else does what she does and that sets her apart for individual attention and it works for her. I think it's rather resourceful of her, and I am still laughing with tears rolling down my face that she walks by your water and casually licks it while passing by. That's hilarious!
Maybe she thinks you have too many other cats.
Maybe if you find a way to engage her in a fun time she might let go of that tool to get your attention with the food grabbing. 
