Going on vacation and need your help!?

Hi im 15 and I am finishing P90x this week and I have gotten great results, i have followed the diet plan to the "T" and for the past 3 months I have not had a cheat day. My major goal is a 6 pack before summer, so far you can see the lines but I have a little fat over it. 3 days after my last day of p90x I am going on a 2 week vacation to Florida. I am going to be back home in exactly 2 weeks after I finish p90x. And as soon as I get home I plan on starting insanity and following the diet to a "T". My question is if I eat un healthy and pretty much eat whatever I want without following portions, eat junk food and all that bad stuff like doughnuts and cookies for 2 weeks will I lose everything ive worked so hard for. I am still going to do P90x everyday of the vacation with extra cardio to stay in shape. I’m also going to drink a gallon of water everyday. So do you guys think I will lose my results and gain fat back even if I work out? It’s my dads birthday so that's why were going on vacation. I’m going to keep track of my weight and if I've gained any inches and make sure i get enough protien. I really down want to lose my results but I thought a two week break is alright because I am starting insanity right when I get home and that is a crazy fat burner. Also do you think after insanity I can have a six pack if I follow the diet to a "T"? I have a 4 pack when I flex. Sorry for the long question but thanks a lot!!! :)