To care for your Tillandsia, thoroughly soak the plant and the shell 1-3 times per week (water more often in a hot, dry environment; less often in a cool, humid one). Plants should be given enough light and air circulation to dry in for no longer than 4 hours after watering.
Be sure to empty the water from the shell as Tillandsias will not survive in standing water. An exaggerating of the natural concave curve of each leaf is evidence of under-watering.
Use room temperature water, preferably rainwater, but if that is not available use tap water that has been sitting out for 24 hours to evaporate the chlorine.