Like many others, I recommend
the Kindle Paperwhite and your phone. I see the Paperwhite as a stack of books, and it has served me well on extended canoe trips and bike tours. The phone can do everything else you want it to do (a lot of which I would have no interest in, but you don't need for me to tell you what your trip should be like). From personal experience, a Kindle Fire is a hobbled tablet (hobbled because it has a proprietary os that doesn't work as well as Android) that is not as good for reading as a Paperwhite and doesn't exactly sip the battery. An iPad is mostly a larger iPhone (which you may decide you need, I don't know).