So, recently on Facebook, I saw someone make shoes for their Barbie by wrapping her feet in plastic wrap, and then judiciously applying hot glue in the shape of a shoe. What an interesting idea! I thought maybe that would work for my glue bottle too!
So I took a small square of foil and pressed it tightly around the tip of the bottle, and applied hot glue. When it cooled I trimmed away the extra foil. It worked! It's not the most attractive cap, but all that matters is that I have a cap again, and can stand the bottle upside-down again.