It's children's tylenol. Check this shit out: https://www.amazon.com/Childrens-Tylenol-Splash-Flavored-Liquid/dp/B071VTPC2S/
They're all like that right now, all flavors and sizes and all. Cheapest I could find was a small bottle for $20, and took 2 weeks to ship.

I'd definitely plan ahead next winter and stock up when there's regular supply again.