@ T33l9
I can see how upset you are by your responses to OP's comments. I understand why you are upset, believe me.
I'd like you to maybe try and see things from a different viewpoint ?
I understand your DS is 2.5 yrs and has been diagnosed as having SEN (as well as maybe a further diagnosis of ASD in the future) ?
I also understand that the nursery he goes to is specifically for SEN children ?
If all of this is correct, then what your issue actually is, is that you know what works with your DS at home, and you'd like his nursery to continue doing things in exactly the same way ?
If that is correct, then what you're not seeing, is that your DC has to learn that in nursery (and in school when he's older), things are done differently. Unfortunately, with SEN kids, this will be a little tougher and take a little longer, but it is definitely worth it, for both of you.
Although your DC has SEN, he is not incapable of learning, or of adjusting to change, same as any child. He will benefit from learning that different places have different routines/ rules.
You actually need him to learn this, so that he can develop his own strategies and coping mechanisms as well as increasing his 'tolerance' of different drinks/ food/ people etc.
I really do understand that you and your DH have spent the last 2.5 yrs learning what 'works' and what your DS 'likes' etc, but the staff at the nursery are not there to maintain your rituals, they are there to help your son learn that the world is different outside of your home/ family.
As he learns and develops, things which he would not tolerate at home, can become things he will tolerate in other places/ situations, and your life will be easier because of it.
Teaching SEN kids new things/ routines is HARD work and ridiculously repetitive, and so is very often better accomplished by people without an emotional link to the child, someone who doesn't get upset when the child gets upset, someone who is more dispassionate, i.e a teacher/ SEN helper etc.
I know it's heartbreaking to see your child 'thirsty' or 'hungry', but if he is to learn and progress, he must go through this (and so must every other SEN child) to be able to develop.
He will learn, that no matter what, juice is not given at nursery, and at some point he will learn that he must accept water if he is thirsty.
The nursery will also be a great help with the 'no dummy' and with accepting more foods and with toilet training etc, but you have to allow the nursery staff to do their job and teach your DS.