While a regulation and mandates usually requires an employer to keep extra records, cause confusion for a lot of smaller companies trying to comply based on each different governments rules, as well as generate more government costs to enforce, the Texas heat is nothing to mess with just as in many states in the south.
I would think an employer who has crews working in the heat would want their crews to be rested and hydrated. Someone handing heavy machinery and passes out, or god forbid, dies on a job would crush that company and cause hell on the general costs of insurance. Also with the number of construction companies, ones that basically tell their staff they can’t drink water I would have to believe quickly will find no one will want to work for.