What do these dreams mean?

So I have an online friend..actually more of best friend. We talk everyday and we really hope to meet each other someday. We both dont know what each other looks like. I had this dream last night, which I dont remember much of, and it was that we both met each other, and we were in a swimming pool. I had a dream awhile ago that we met each other, but we were swimming in a lake. What do these dreams mean, and why are they associated with water?