Orchids, when water correctly can last you 2-3 months. Of course, several factors can affect the life of an orchid such as indoor temperature, soil health, plant disease and humidity. For argument sake, let's say your environment is perfect. Here is our way of watering our orchids.
The best way to water an orchid is to give it a good 5 minute soak until the entire top soil is watered. Fill a bucket with water and dip the orchid pot into the bucket until water seeps through from the bottom of the soil to top of the soil. Let it sit for 5 minutes.
With a damp paper towel, wipe the bottom and top of the leaves to make sure there is no dust collecting on the leaves.
With a spray water, spray the blooms generously with water.
Take the orchid out of the bucket of water and let the water drain. In the meantime, check to make sure that there is no water trapped at the bottom of the leaves because this can create mold when it's not wiped dry.
Water once a month.
If your orchid is potted into another container and it is a hassle for you to take out, lift up the moss covering the top soil. Spray top soil with water until it is moist. If you don't have a spray bottle, grab one ice cube from the freezer, smash it into smaller piece and scatter it on the top soil.
The best orchid food is the nitrogen in the air. No artificial food necessary.