Day 14 → A non-fictional book
Alright, now if this means a book that's actually real, then I'm going to recommend The Three Musketeers because it's kickass and I loved it.
Day 15 → A fanfic
There are a huge number of great fics in the various fandoms I participate in, but I'm going to say After the End from the Harry Potter fandom because it was the first multi-chaptered fic I ever followed. I used to wait eagerly for each new installment and I remember how crushed I felt after the final chapter was posted just after Order of the Phoenix came out and there was a happy ending in the fic for characters no longer among the living in canon. Honestly, I don't remember much of the plot, but I just know I enjoyed it at the time and it was a big deal in my Ron/Hermione and Harry/Ginny obsession days.
Day 16 → A song that makes you cry (or nearly)
I nearly cried the first time I heard Punch Brothers' Blind Leaving the Blind, Movement One. I don't really know why. Youtube doesn't seem to have the whole thing, but this video is at least half of it.