Hey Jose, TURN OFF THE WATER HEATER then turn off the water at the Meter with Your Customer Shut Off Valve (if you don’t have one then call the Water Utility and have them turn it off at the Curb Stop) or go to Home Depot and buy a Valve Wrench for $10.00.
After shutting off the Water at the Meter open the outside Hose Bib then go inside and open ALL THE FAUCETS IN THE HOUSE AND LEAVE THEM OPEN. THAT WILL DRAIN THE WATER LINES IN THE HOUSE. NOW TURN OFF THE HOUSE HEATER.
Personal Note: The ONLY way the Human Race has survived this long is due to massive procreation numbers, because there are WAY TOO MANY STUPID PEOPLE OUT THERE !!!
Yes, Texas homes in southern Texas are not built for a hard freeze. Add loss of heating due to no electricity, then pipes freeze. Only way to prevent, turn water off at the meter and drain the pipes. What little water is left in your pipes can expand when freezing without busting the pipes.