Replacement Chug Lid for Simple Modern Summit 14 18 22 30 32 40 oz Water Bottle, Leak-Proof Spout Cap with Ergonomic Handle, BPA Free

What happened to the lid? What is your son drinking from the summit? Anyway, It looks like this one would work. They're showing a 22oz summit in the picture, which is the same dimensions as the 32oz summits. https://a.co/d/04xE8WKY You'll be able to see the gunk, but also silicone like the above is hard to clean imo. There are also chug lids, but I'm not sure if you're just after the straw lid? https://a.co/d/0b3RHyeg