I have an idea I've always wanted to be implemented in a Zombie game: craft able weapons using chemistry

Just like in the Fallout franchise you can use used ammo shells, lead and gunpowder to make usable bullets.

In a world ruled by zombies one would find more shell casings than bullets. Also if someone is not surrounded they might be able to pick their used shells.

Lead could be found in art stores and remolded for bullets.

Gunpowder can be made with sulfur, charcoal, and saltpeter.

Sulfur in the game would be found in chem labs along with other useful items.

Charcoal could be found in small quantities in art stores and in large quantities in "Costco" esc. places. If necessary it could be made from scratch.

Saltpeter can be made from guano in caves or manure from cow farms, which ever is easier for the devs.

useful link: http://cavemanchemistry.com/oldcave/projects/gunpowder/index.html

A lot of other useful things can be found in chem labs like thermite and phosphorous. Thermite could be used to open locked steel doors that protect useful items. phosphorous can be used to make phosphorous grenades which would distract zombies with a bright white light.