How to add apps on Apple Watch without an iPhone?

To give some background information, I had an iPhone that is connected to my Apple account but I lost it. After I lost it I got an Apple Watch and used my mom’s phone to get it setup. My problem is that I want to download apps that require an iPhone but I can’t use my mom’s phone because she already has a main watch set up with it. Does anybody know a way that I could download them without an iPhone?