These are easier to grow when you start out. These plants are probably in a plastic pot containing bark pieces. Water the plant once a week minimum, more often if sunny and dry. Make sure all water drains out of the pot at the bottom. Water in the morning, never in the evening.
Orchids love it.
If it is dry, feel free to mist the plants with a little sprayer to whet the plant leaves once a day, in the morning, never at night. However they also like temperature variation , i.e. warmer during the day than at night. In a house that is not easy to accomplish, but if possible give the orchids 10 to 15 o F less at night than at daytime. Fertilize once a month normal strength, or with a weaker solution twice a month. Dilute according to instructions.