The two prepositional phrases here are “in many bottled beverages” and “in the early 1700s”.
Prepositional phrases start with a preposition (in, at, under, to, with, etc. look up list of prepositions) and end in a noun (person, place, thing, or idea). They can describe a noun (person at the store) or verb (go to the store).
I hope this answers your question.