Hiya!
It's not the end of the world but you must get your head back in the zone, this diet works wonders but only if you let it do it's magic and that means really hanging in there for ketosis and drinking the water and staying abstinant, if you start to pick then the diet goes from very easy to very very hard so time to get stubborn, in terms of weight etc it won't make much difference at all so don't panic and just move on and forget about it, if you beat yourself up it will lead to the dark side (of the fridge!)
Oh lisa please don't drink vodka when on the diet, check out other threads about drinking on a VLCD as it can be very dangerous regardless of which spirit it is.
Mike