With half of all people gone, the infrastructure and food must have been greatly reduced. In five years, how would they have fed a population that suddenly doubled?
At the end of Endgame, the un-snappening results in the return of all of the humans and other forms of life that Thanos destroyed in the Snap.
This presumably includes a significant number of animals (and plants?) that are now available for harvesting. The governments of the world, now back up to fighting strength in terms of manpower, presumably had contingency plans in place in case the population returned as fast as it had disappeared. This would presumably include the stockpiling of rationable items like MREs.
Far From Home shows that a number of issues have been caused by the Blip, Aunt May is hosting a benefit to raise money for all those made homeless by the blip (she says she reappeared in her old apartment to find other people living there). I imagine other charities have been set up and governments have had to scramble to deal with the sudden influx of people. There are also the added issues, people who claimed to have been snapped when they where not, pay out of life insurance now needing to be paid back, children and babies blipping back with no idea where there parents are living now. Parents blipping back and having to hunt down and find there children who have had 5 years dealing with the loss of there families. I imagine as well that a number of people committed suicide, died of natural causes etc, they won't have returned and people who where snapped out will have to deal with emotional fallout of finding out they have returned, but there mother/father/husband/wife/son/daughter is dead. I imagine the impact will reverberate around the MCU for a few more films yet.