Find an item that you want to duplicate. Hold a stick and turn it into a weak spear. Now pick up the desired item and you'll have an unlimited quantity at your disposal.
The Calm Forest (v0.0.3)
On the title screen, type in veganmode and you can play without fearing attacks from cannibals. When you save your progress and play again without that mode activated, you'll retain any items and your structures will remain in place.