Should I continue to water my tree roots to save my trees?

Hi, Well if you can keep your trees moist they should be fine However, when you say the leaves have dried up, I wonder if it isn't too late for your trees. I don't have enough information to go on here, but I'd say, if the trees aren't already dead, then keep watering them as long as you can. And, put a thick mulch of shredded bark or some other material around them to preserve the precious moisture you are adding.