Hey Girl!
I might have a few answers for you.
First, the program is NOT 3 meals and 3 snacks... It is WAY MORE food than that! You are looking at 5 MF meals (the little packet) + 1 Lean and Green Meal (some protein and a lot of veggies) + 2 optional snacks (donot have to be big... It can be some SF candy or the MF snacks if you want to buy them... I don't). I use my snack as extra food like when i make biscuits out of the Creamy Chicken soup, I like to top it with Laughing Cow cheese or a string cheese...
Second, This program is very travel friendly... You just need a microwave... Or, if not available, you can always prepare some food ahead of time... By this i mean that u can make some biscuits for one meal, a banana bread for the other one... etc... The Possibilities are endless if you are willing to try the recipes...
Some are good and some are really gross... It is all a matter of personal taste... I posted the one that i found on the mymedifast webiste that i actually love! Just keep in mind, that when you see pancakes recipe as a exemple, it will NOT taste as good as the real thing... But pretty OK for diet food...
Third, about the Ketone question, they ask you to take some fish oil supplement every day. I take 6 pills just to be safe and i drink ALL my water.
This program works... At least for me and all the people i have seen on the website... What is amazing for me is that i have absolutely NO cravings and no wanting to cheat (except for yesterday but it was linked to that bad time of the month!). I have been on it for close to 3 weeks and I love it so far!
As far as buying it, you can buy 4 weeks at a time with 1 extra week or you can do 2 weeks, but you do not get the extra week... It is up to you! I personally go to a center so that i can pick my own food and if i do not like something i can trade it in... One of the advantage of the center is also that you ALWAYS get an extra week and not just the first time you order... If you have alot of weight to lose like me, it is a pretty good deal! Roughly around $55/week. + They take your measurment, get you on a really cool scale that tells you precisely where your fat is and what you body composition is...
Sorry for the length of it! I was just trying to be as helpful as I could