Hi Nattom
If the hog has made an actual nest in the sack there probably isn’t much you can do until it’s vacated, other than as you have done by providing an alternative. The hog may just have been sleeping there for the days and may move on. Once the hog has vacated (by which I mean completely vacated not just out for night time wanderings) I would remove the sack and, if the hogs have regular access, any other things which might become a problem.
Well done for providing water. That’s very important for hogs – all day, every day.
Good luck and happy hog watching!