Dr. Squatch is making a new soap with a secret ingredient: Sydney Sweeney’s actual bathwater.

Sweeney announced she’s partnering with soap brand Dr. Squatch to sell a limited-edition line of bars infused with drops of her actual bathwater.

“I was like, ‘This is just such a cool way to have a conversation with the audience and give them what they want,’” Sweeney told GQ of the soap—a playful (and likely lucrative) nod, then, to the soci...