If you are trynna craft it and you wanna get the hide, get a torch and find a moschops and torch the moschops until it dies. moschops give a really solid amount of hide

Try killing small creatures they give a good amount of hide.

I’m on mobile and I can’t seem to find a way to fill it up in the ocean. I got it in my hot bar and I try using it while under water or in the shore line but it doesn’t fill up