Tenants and homeowners who have ice maker and water dispenser will have a filter for the water. This filter has to be changed periodically. Tenants who are provided a fridge at a rental property. You have to have to find the filter which can differ depending the model and style. 

This video can help you identify areas of a fridge to look for your filter. After finding filter, you can order a replacement filter at a hardware store or online by looking at the information on the filter. 

Also, you can google based on the model number that you can usually find on the inside of the fridge what kind of filter it may require. 

https://www.youtube.com/watch?v=yFqk3RHI9Y