I was driving and hear a loud pop and car became difficult to steer. Looked in my rearview and saw a large puddle

Hello, it could be that excessive power steering fluid pressure caused a leak of some kind. Even if the fluid was low and there may have been some other kind of leak in the first place, this could've made it worse. It's so hard to say. A physical inspection is needed to find out what's going on and what needs to be done to fix the concern. But yes, it does seem that you may have lost all the fluid. Perhaps a pressure hose has failed? Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops