How do you spawn in things offline in minecraft?

Answer 1

There is 2 mods that will allow you to do that. One of them is called "Single Player Commands". It allows you to spawn items, enable "noclip" which lets you fly and go through blocks, and a lot of other things. Next is the one i personally use called "Too Many Items" which only lets you spawn items, but it lets you make "saves" and lets you have infinite stacks of items. The saves feature lets you get back all the items you had before if you lose them by dying or something like that. you get infinite stacks by holding shift and clicking on a stackable item. If you shift click on a tool like a pickaxe or a shovel then that item has infinite durability so it wont break. You can get both of these by searching them on Google and there are plenty of YouTube videos of how to install them if you need help.