Hotel
There are some rental cabins available onsite as well as RV hookups if you would like to use one of those instead.
Flight
The nearest airport is Dallas, TX but Oklahoma City, OK is just a little further distance to Moyers, OK if you would like to look at either option.
House Or Rental
There are a few options vacations rentals in the area if you would prefer to go that route. Antlers, OK is just a few miles down the road from K River. https://www.VRBO.com/ is another option.
House Or Rental
We used this website to rent and RV for a river trip. They were awesome and reasonable. You can have the RV or camper delivered right to the campsite and setup for you for a small fee if you don't want to have to worry about any of that. It made our lives so much easier and all we had to do was show up and unload. You will have to reserve a campsite with K River as well so please keep that in mind. Another option for rentals is https://rvshare.com/