One of my houses was hit hard by the Texas freeze, with the main water pipe broken in several places. I finally got my spot in a plumber's long work list and they replaced over 80' of pipe.
The house was without any water for 5 days (and that was a single potable source outside), and without hot water for almost 2 weeks. My insurance company said they will cover lost rent due to the emergency. I don't have any specific text in the lease about crediting or reducing rent payments under these circumstances.
In Sec. 92.008. INTERRUPTION OF UTILITIES. "...unless the interruption results from bona fide repairs, construction, or an emergency." It seems like there is no state law basis for rent credit for no utilities and that I satisfied my duties as landlord.
I can't be the only landlord in this situation in Texas right now. Several college students have been relocated to different apartments because of similar issues. I didn't have another house to move these tenants.