My family and I will be going on our first cruise vacation via the Oasis of the Seas on Dec 11. I chose the "My Time Dining" and the prepaid gratuities. Since we are new to cruises, I was wondering if anyone can help with prepaid gratuities? Does it mean that all gratuities are covered? How about for the restaurant or services where we pay out of our own pocket? I also see the prices on water and juices package (seems expensive.) My question is whether if those are necessary. Can we get water/juices from the buffet area or other locations in the ship? Sorry for the newbie questions and thanks in advance for any help.