Hi Thin Lizzie,
Believe me, the easiest time that you do this is the first time. I've broken every rule in the book, which is why instead of getting to goal, I've just but 3 stone back on.
Have you broke the diet yet? Cos if you haven't I would seriously think about just trying not to break the diet. Honestly, like Mike says...once you taste food...or learn that you can stay in Ketosis by having the occasional atkins style meal, your brain will try and persuade you every evening how 'just a little' will be ok. Honestly it is the start of a slippery slope...which I slide down regularly.
Also, you can drink alcohol (like MIke said - not recommended) spirits and diet coke should keep you in Ketosis... and as you are dehydrated the next day, you may even lose weight, however...what do you want when you've had alcohol...if you are like me...it's a curry or a kebab...and then the next day...when hung over...what do you want? Anything to comfort.
I'm not saying that it isn't possible to cheat and still get to goal, because it probably is if you set yourself goals and structure. But I promise you, it's the ones that do not cheat that get to their goal and it's the perpetual rule breakers (ME) that keep seeing people pass me on their way to goal.
But...for what it's worth, thats my advice...stick with it and allow your social life to suffer for a couple of months and then, once you are at goal you can party all you like!! Of course, I don't follow my own advice, but I'd be thin if I did, LOL