The Apocalypse Regressor's All-Purpose Shelter

After being bitten by a special “Alpha” zombie and dying, the protagonist gets a second chance—returning to the time before everything collapses. Armed with memories of the coming apocalypse, he uses the brief window to prepare (including making money through crypto), seeks out people he once fought alongside, and starts building a survival team under the pretense of prophetic dreams. The story focuses heavily on practical, realistic shelter-building and methodical preparation as the apocalypse begins. — Description from novelcodex.org