Why is it “mucha” not “mucho”? Is it because it modifies Coca Cola?
Yes, exactly! Here mucha is a pronoun and needs to agree with "la Coca Cola", that was mentioned previously and is referring to it.
If we weren't referring to something specific, then we would use mucho as an adverb:
Mi abuela bebió poco pero yo bebí mucho.
My grandma drank a little but I drank a lot. (adverbs)
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