I think feasting on soylent and algae chips will really help get them immersed
Spam should still exist. That's a running joke in any far-future campaign I've ever run.
There’s a brand called Chirps which are chips (crisps ) made from cricket flour.
Make sure to get them some Hot Brown Drink too (but only if they're good)
You could make "sausages", and there's vegan recipes too. Really hammers home the "mystery meat" vibe while also being actually tasty.
EDIT: I'm doubling-down on vegan "sausages" because tofu is the perfect cyberpunk foodstuff.
Tricking my carnist friends into eating vegan on the pretense of it being themed game food
1 Nuyen is roughly 1 Big Mac, at least according to the Big Mac index. This applies to consumer goods mostly, but the specific example of a Big Mac is actually around 12 to 15 nuyen on account of its ostensibly real meat and somewhat fresh ingredients.
The protein bars they sell at grocery stores are like, 80% of the way there to the protein blocks they serve in Snowpiercer.
You have insufficient nutrition credits for organic foods. You will be restricted to synthetic nutritive slurry for the remainder of the work month.
You could do a bit where they have to rent the tumbler that the soylent is in if they don't have their own and then pay by the sip. Or they could save some money by getting the ad-supported version.