I do intermittent fasting so if the trip starts in the morning I won’t need food but a liter of Snapple Diet Peach Tea is always welcome–mostly because it has a screw on lid and still tastes good when it gets warmish.
I’m gonna give two answers:
If I’m driving: I typically don’t eat while driving, but six hours is long enough that I’d probably stop for lunch at some point. So I’d have a cooler containing a turkey sandwich, apples, and a Coke Zero, which I would stop and eat as a picnic somewhere. (In reality I’d have a bag of chips as well, but we were limited to two food items so if I have to leave something out it would be the chips).
If I’m a passenger: Trail mix, apples, and a Coke Zero. I guess I really just swapped the sandwich for trail mix there. This assumes the driver is planning on a lunch stop at some point and these are just snacks to munch on on the road.
Beef jerky, granola bars (the kind that are practically candy bars), and lemonade flavored Gatorade, assuming I could keep it cold. Otherwise, water.
A cereal bar (in case I’m actually hungry!), a small bag of chips, and a tin of ginger ale.
Because fizzy pop and a bag of chips is always fun anyway, even if I’m not hungry!
Footlong meatball sub from subway, massive kit kat candy bar and my Circle K Jacuzzi sized 100 OZ Coke.
Percocet, adderall, and beer
For a 6 hour trip I’d have nothing at all and thus cut down the trip to 5 1/2 hours by not stopping at all (which is doable in my Prius). Thrombosis, schmombosis.
All I need is a full tank of gas, half a pack of cigarettes and sunglasses.
If I’m not racing the Chicago PD to Daley Plaza, I’ll take some Combos, Beef Jerky and a Coke.
If you’re serious…
I have a vague recollection that you live about an hour and a half south of me and helped when I sought information about your area on behalf of my parents. (Thank you again, by the way!)
I checked to see if this store is in your area and it’s not (yet), but there are locations in Eugene, Springfield, Bend and Medford. You might stock up next time you’re in one of those areas. Serious savings in quantity on many items, no membership required, they take most major credit cards and cash.
I did a quick search on beef jerky with these results. Check it out and you can decide if it’s worth the drive. 
Re the OP’s question, I’d pick trail mix and cheese sticks, with sparkling water to drink.
Hit it.
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Having completed a 2500-ish mile road trip a couple of weeks ago with daily drives of no less than 4.5 and no more than about 7 hours, I think I have some insight.
Drink: I’d get a 32 oz Diet Pepsi or Coke Zero (whichever was available). I’d also take my Yeti and fill it up with ice ahead of time.
Snack 1: Trail mix (the basic peanuts, raisins, M&Ms kind)- 1 lb bag from Wal-Mart.
Snack 2: Granola bars- the crunchy kind (Nature Valley, I believe).
Those were the things that I found to be the most efficacious in keeping me awake, alert and not hungry for extended periods. Of course, we usually stopped for lunch and ate sandwiches or occasionally at local restaurants.
Costco and BJs. Costco has big bags of Pacific Gold brand and their own house brand. I’ve seen another brand at BJs but don’t remember the name.
Diet Pepsi, with a LOT of ice. Cheezits. Donuts.
20 oz Diet Coke
Bag of pepperoni pizza Combos (cracker not pretzel)
Twizzlers or something chocolate like Junior Mints
In reality I’d probably have more options with me, but I could only choose 3.
That’s part of the fun of a road trip - eating snacks! Not meals - hate eating a meal in a car.
In the past, when I drove long days, it was corn nuts and Coke. Nobody can fall asleep while chomping on corn nuts.
Your dentist thanks you.
I like beef jerky. I rarely will get a small bag of sour candy but honestly your ratios are screwed up. I just did 6 hours yesterday and I had a liter each Rockstar, Gatorade and water on my outward three hours then did a liter each of gatorade, water and mountain dew on the return trip.
6 hours really isn’t much of a road trip but when I do my thousand mile runs I figure a liter an hour to drink and a bag of chew and two giant bags of beef jerk preferably hot.
I once did the Alcan on a coffee can of chocolate chip cookies and a 6-pack of Coors.
These days I’ll take a liter of water, trail mix and granola bars. Or just tough it out - 6 hours ain’t long.
In general, I stop every 90 minutes or so on a road trip just to stretch my legs but I agree, most people can go six hours without food or beverage. Thank goodness, otherwise we’d all die in our sleep.
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Oredigger77 **, a liter an hour for six hours, seriously? I don’t think I drink that much fluid total in most 24 hour time spans. (Very hot environments being an exception)
Is there something special about Cracker Barrel malted milk balls?