I mean, yeah, you're going to need to suspend some disbelief for any zombie media.
This criticism is weak, though. You can see the fungus slowly replaces human cells over time. You could see when the girl cut that zombie trapped under rubble; there was no blood, just more fungus under the skin. Simplest explanation is that the fungus is feeding off of the hosts.
Plus, it's a fungus so it probably absorbs water and nutrients through the air and contact with other biomass.
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