I never track rations unless in specific situation where the PCs face an unexpectedly long trip. However, they have to pay for a reasonable amount of rations at each town. It's just a buy-a-bunch-and-it's-fine system.
They can carry Str score rations. I don't generally bother unless doing a survival game or stressing that bit.
@Homebrewandhacking @mimic oo that's a very good simplification!
Not original to me, I'm afraid.
https://a5e.tools/rules/journeys
#A5e is pretty focused on journeys.
However, if you steal some concepts (like we did off PF2e and Starfinder) then the following might be of use to you. (Don't worry, it's free.)
https://www.drivethrurpg.com/m/product/440844
@Homebrewandhacking @mimic thanks for the recommendation!