I'm in the same situation: high school ceramics classes, from home, no clay. I started in with the Great Pottery Throw Down this week. Today, I'll see what their first reactions are like. I found the quality of the videos for that show on YouTube to be much better quality on Season 2, so I started with that. Here's the link to my KWL chart for Episode 1 in case that's helpful to anyone: https://docs.google.com/document/d/1yNREgTa83QmrL1NjrkW3pBuip42zEG46xRvNgmACIc8/edit?usp=sharing
I'm thinking about having them use free 3D modeling tools to create pots that way and then perhaps Pixlr to "glaze" them digitally.
I'm looking forward to hearing more ideas from other teachers.