Wyrmwood: Apocalypse 4K 2021

Ex-military Reese lives in a zombie-infested Australian wasteland. He begins each day by tidying up his small household - watering the garden, feeding the useful (used for energy) zombies, scaring away the useless ones, replacing the depleted ones with new ones - and then he goes hunting. He traps the few survivors of the apocalypse and surrenders them to a military surgeon as material for experiments, and in return receives pills, which he takes every day. One day, Reese catches Grace, who has been bitten but not fully converted, and takes her to the lab, too. But soon her sister comes on to him and forces him to go and rescue Grace.