I am not sure you will be able find suitable shower curtains between now and your scheduled departure on your first camping trip.
One option is to order replacement curtains from the factory.
Here is the link to their parts catalogue:
http://www.trailmanor.com/storage/ap...atalog2018.pdf scroll down to part # 11009 (6x6) white nylon shower curtain. The factory might be able to get it to you in time.
Dick