Funny enough, I just came here for the same reason.
My bike is about 1.5 years old and the left side water holder just broke from normal use. I'm not sure if they have newer versions, but I hope so.
EDIT UPDATE:
Found this just now that looks like it'll do the trick:

Amazon.com : ATP Sports Extra Large Bottle Holders for Peloton Bike - Does NOT fit Peloton Bike+ - All Metal Design - Fits Yeti + Nalgene + Hydro Flask (2-Pack) : Sports & Outdoors
Amazon.com : ATP Sports Extra Large Bottle Holders for Peloton Bike - Does NOT fit Peloton Bike+ - All Metal Design - Fits Yeti + Nalgene + Hydro Flask (2-Pack) : Sports & Outdoors
www.amazon.com