White worms are not the easiest creatures to find on the ground, and unfortunately, they are the most abundant in a quite dangerous area, near the big oak where the laboratory is located near the place where the Explosion occurs when you try to use the mysterious machine.
To get the skin of worms and whitewalls, head to the oak, then look on the ground fallen acorns. When you find one, crush it with your hammer, then pick up the broken shell pieces. You can now make a shovel, which you will need to get white verses.
How to find worms and skins of Grub
You will now need to look for small disturbances in the mud that look like something that ramps below. These are quite common in the wetter mud under the tree.
When you see one, land with your shovel, then go to your ax or launch and hit the worm with it until it die. You can loot the corpse for Grub Hide. Grub Hide is very important because getting you will allow you to build a canteen that you can use to store water, which will really make life easier when you try to survive every day.
The main things to pay attention in this area are all spiders. These are the most difficult enemies to handle in the game, so it s a good idea to configure a lean-to somewhere, because the chances you need to reappear are quite high. Make sure to set your new Lean-to as a reappearance point by interacting with him and clicking the Define as reappearance option.