Each plant needs a different amount of water due to the circumstances that they have in their surroundings. A plant that is in full sun might require twice as much water as one in part-shade, and windy location can cause the plant to need more water as well. Best way to know how often and how much water to give to a plant is to observe it for a couple of weeks in the location that you put it in. If you see it wilt, that is a good sign that it needs more water, but be careful, wilting can also signal over watering and cell collapse. If you are uncertain, a moisture meter will help tell you if it is too dry or too wet.