StormHunter

HI everyone,
   My wife, 2-year-old daughter and myself are just about ready to book a cruise sometime in October 2019. I'm all about pre-paying for stuff so I don't get a large bill at the end (happened in a previous Carnival cruise and almost ruined everything for ur) Other than anything I purchase on the ship and if I pay for gratuities up front, am I to expect anything else pop up on my final bill? Also, if I purchase the drink package, the gratuities that are included, will this also take care of the $14.50 per day, meaning, I wouldn't have to prepay for gratuities? Also, I don't drink at all, only my wife, does anybody think I could get around with just 1 drink package? Some Travel Agencies Websites, state if booking a Balcony or higher will offer to pre-pay gratuities, will this, in fact, mean I won't have to pay gratuities at all? One final question. I will book the cruise for the 3 of us, which we have US Passports, but in the meantime, I'm trying to convince my sister to come with us, which has a Portugal Passport, is there any problem at all with me adding her to our room in the future?
As you can see I have many questions, but I love seeing and listening to Matt and this here group seems amazing! We are very excited about this cruise and just want everything to go well. If there are any other tips that can be offered it would be most appreciated.
Thank You