Well, generally speaking, dehydration will not cause the eye twitching. As we know that it is a condition that occurs when the loss of body fluids, mostly water, exceeds the amount that is taken in. when someone has dehydration, there are more water moving out of our cells and then out of our bodies than the amount of water we take in through drinking. In this way, our body can be disordered and in serious case, it can lead to death. But on the other hand, there is nothing to do with eye twitching. So you should not worry more about it. Just be careful about your body's condition and make your water supply be on balance.