The Apocalypse Arrived, and I Didn't Stock Up

【Apocalyptic Zombies, System Space, Dark Protagonist with No Saintly Streak, Team Building, Decisive and Ruthless, Mutation】The apocalypse arrived overnight. Flesh-eating zombies were everywhere, the world was shrouded in doom, order collapsed, and supplies ran scarce. Survivors had to fend for themselves amid the chaos. Everyone began putting self-interest first. Abandoned Ye Wenshan unexpectedly awakened a System ability. Mission One: Successfully repel the invaders and unlock a super-safe house. Mission Two: Go two days without drinking water and unlock water supplies in the Level 2 Shop. Mission Three: Trade food with ten survivors and unlock the Level 3 Gourmet Shop.