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They mostly pick out of dumpsters, staking out & waiting till right after the store/resturaunt tosses unsold food at the end of the day. Or they might visit a food bank (places that feed the homeless). Or if they manage to scavenge enough fallen money, I imagine they'd buy food from a Dollar Tree. The majority of their money probably was leftover from Jeb during the 4-year stakeout plus what Dr Martinez gave Max in the same book.
The line about the fridge being empty and ‘maybe the food fairies had come’ always bothered me coz like, how DID they get food??? It’s not like they could go get a job or something. Do they just steal everything? I mean, we know that they can forage/scavenge for some stuff, coz they go strawberry picking. But they can’t find everything in the woods, they must have to get some things from shops. Like Iggy cooks eggs, and they obviously don’t have a bunch of chickens out back, so where does their food, and their money come from??