Did you know there's a right way to water houseplants? First, don't overwater; just stick your finger about 1 inch down in the soil. If it's very dry, the plant needs water. Then determine what type of tap water you have at home. If it's chlorinated -- most towns use chlorine to clean water -- fill your water pitcher with tap water and let it sit out for 24 hours to let the chlorine evaporate. If you have hard water at home, which leaves mineral deposits on your shower, get tap water from a filter and use that to hydrate your plants.