Do most farmers water their cattle in the winter or can they get the water they need from snow and standing water?

I don't know about were you live but here in Texas we don't get snow. But my dad has cows and i know that he gives them water in the water trot and if it freezes they can go without for a couple of days. I do know that they do not eat the snow but they might get moisture for the air i don't know.