Most people kill their house plants because of water.
This amount will have to be determined experimentally with each plant you own. For example, if you have too identical plants, but one is in a sunnier area than the other, the sunnier location could very well need more water. Many plants will tolerate getting dried out for a brief time. Your strategy can be to wait for plants to limp before they get more water. Too little water and too much water affect the same appearance, i.e. limp.