How to fertilize your airplant
Air plants don’t require much fertilizing, but feeding them once in a while will promote blooming and reproduction (pups!).
Recommended fertilizers

Water bath with fertilizer
Fill a bowl with lukewarm water
Mix a small dose of fertilizer into the water
Place your air plant in the water and let it sit for 20-60 minutes
Lift it up and make sure you shake off all excess water
Place upside down on a towel in a bright place with good air circulation
Let it dry for about 1-3 hours
Note
Make sure the Air Plant is dry within 3 hours, and check that no water is left in the base

Spray with fertilizer
If you placed your Airplant inside a container you can spray it with a fertilizer solution.
Fill a spray bottle with lukewarm water
Add a small dose of fertilizer and mix
Mist around your plant, and not into it, to avoid water getting logged in its base - which can cause it to rot
Dosage
For small containers: 1 spray
Medium containers (3-5 inches): 2-3 sprays
Large containers: 3 or more sprays
Feeding Airplants increases the chance that they will reproduce. — Planta tips