
PC gamer,
Jep got 3 piles of clay.
1 for the pottery making. The clay will be on the right side of the wheel. It never gets used up.
1 for the first mold at the sand.
1 for the second mold on top of the cliff.
So you should have enough.
I don't think there's any other source. I don't think you can get clay from the side of the pottery wheel. You can try and see.