True dat. They need a big flooding rain in the Pecos River drainage to fill up Red Bluff Lake. I am not sure if they are allowed to pull water from it for fracing.
I don’t know what the restrictions on using surface water for fracking are in Texas, if any. In New Mexico all surface water is appropriated and during drought years junior user’s rights can be paused so as to make required interstate water transfers to Texas.
As far as groundwater goes, those with water rights for agriculture can transfer those for use with drilling and groundwater basins are closed for new permits. I know that along the NM-TX border, water haulers get water from Texas to use in drilling in New Mexico.