I've seen 的 used after a verb like this in other sentences. The only thing I could find about 的 after a verb was when it's used with 是.
喝的 is something for drinking, simply some drinks. 的 is something, some stuff, unnamed stuff, something related to.
Chinese is less bound to type of words comparing to English.
Interestingly, you can replace a verb with an adjective, a noun, or a pronoun. 的 is just something related to a word.