I am seriously SHOCKED OP! It's bad enough that he thinks the cups not being stacked to his particular liking, warrants a text telling you off about it in the first place, but then another telling off because you didn't respond straight away?????? This is absolute MADNESS!!
Why on earth are you continuing to bother working at this relationship, it seriously isn't worth the effort, and as you said yourself, 'everything you say or do is wrong in his eyes'. As far as I'm aware we are free to do what we wish in this country, so why are you willingly staying in what is in my opinion, nothing but a prison, where you are expected to do as you are told 24/7?
I must admit I can't help asking myself, if he's actually resorted to 'punishing' you physically yet, and if that is perhaps the reason, that you try so hard to do everything just as he likes it, as men like this, do tend to become violent when people fail to do as they are told.
Please OP, stop taking this shit from this man, you've said your relationship is on rocky ground, and I dare say, based on experience, that far from the long weekend away, being a time of fun and relaxation, it will be spent walking on eggshells to keep this God of a man happy.
Finally, can I ask how old your children are OP? As I'm hoping they're really young, and won't remember all this as they get older, as what you're currently allowing yourself and them to live with, will be really damaging, and if they are older, and I'd lay odds that they're scared of him, which is no way to feel about your father.
My advice as you've probably already gathered, is to get your ducks in a row, and leave a.s.a.p., as his abuse will be mentally damaging, even if he hasn't gone further yet.