In order to get bombs in survivalists, you will need to craft them yourself or find them as loot. To craft a bomb, you will need the following materials:
-1x Gunpowder
-1x Sulfur
-1x Charcoal
-2x Steel Scraps
Once you have all of the required materials, open your crafting menu and select the Bombs tab. From here, simply select the type of bomb you wish to craft and follow the on-screen instructions. Bombs can be used for a variety of purposes, such as destroying walls/structures, killing enemies, or clearing obstacles.