How to remove air from water supply line?
You can use an automatic air vent for the water supply. It has a air chamber and a float that will automatically bleed the accumulated air. They are also relatively inexpensive.

The automatic air vent is commonly used for for hydronic water heating systems but make sure its approved for potable water in your case.

This Honeywell EA122A1028 should work.
Honeywell EA122A1028