We are thinking we can simply leave the strainer out of the water line. I found one that will replace the cracked one, but it costs more to ship it than the price of the part, adding up to $20. It's OK if necessary, but we don't see why we really need it. If anyone has insights about this, please share.
Here is the website where I found it:
https://mkrittenhouse.com/us/shurflo-st ... assemblies