No. Male or Female (Dioecious) is already determined the moment the Egg is fertilized. or Monoecious both Male, and female organs on the same plant.
Drought could cause stress, and make a female become Monoecious.
Water will not determine sex. Now, heat and light stress can cause a plant to herm. Make sure your temps and humidity levels are good. 72-76 with a 10 degree drop at night. And keep humidity at 60-70% during veg, and like 30-40% in flower.
