Air plants need three things for good health: water, light, and air circulation. Air plants should be fully immersed in water for 30 minutes to an hour once per week. Ideally you will submerge them completely in bottled water or rain water, but if these are not available then tap water will suffice. After watering, it is critical to allow air plants to dry to avoid rot, which is the biggest danger to air plants. Dry them upside down, especially bulbous-shaped ones. Most air plants prefer bright, indirect light such as light near a south-facing window. They can take a bit of direct sun, but too much is deadly. Always balance the amount of light and water to compliment each other. They prefer to be dry most of the time, and cannot survive sitting water. They like breezy conditions, if possible, so try to display them in such a way so that air circulation is maximized. Balancing water, light, and air circulation will keep your plants alive for many generations.