Apocalypse: Starting By Hoarding A Billion Food Additives

The end of the world came. “I have been reborn?” exclaimed Zhao Feng in disbelief. As someone who had scraped by in the apocalyptic world for 20 years and eventually ended up eating anything he could find, he had never imagined that he could actually be reborn.
His uncles happened to want to seize his assets. Zhao Feng instead counter offered: if they wanted his stocks, they had to exchange them for 1 billion. His uncles gladly agreed.
When he received his 1 billion, Zhao Feng was very pleased. When the end of the world came, only food had value. Everything else would be worthless.
However, what would he hoard? Food? Instant noodles? Clean drinking water?
Zhao Feng was in a dilemma. Just then, he awakened a Profiteer System. As the name suggested, only those who reduced their cost to the minimum and squeezed their clients of their last drop of worth could be called merchants. Zhao Feng was stunned. He was clearly a good guy.
However, just then, the system suddenly gave him rewards.
[The host has carried out an underhanded deal with his own uncles. The host is rewarded with unlimited space.]
Zhao Feng was perplexed.