The best you'll find in/near Big Bend will be RV camp grounds with 50A outlets. Some of the lodging have 15A outlets but that's not enough to enjoy your time there. There are two newer ones out in Terlingua that are J1772.
If you want to use the RV campground you'll want to make sure they're OK with you charging an EV there and be prepared to pay full rate. Those types of facilities have been known to be cranky about EVs.
I believe in Terlingua there's a hotel with RV place across the street.
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