Interestingly, according to Kikar, while in court for a hearing about extending his remand, Mr Neturei Karta requested an escort from the court so he could go to the mikva. He claimed, via his lawyer, that he is on a hunger strike of sorts because he cannot eat without first going to the mikva. 

I thought men's mikva immersion nowadays is mostly for prayer, with an element of kedusha. I dont think I ever heard of it having to do with food (unlike in the days of old when mikva was need for tahara to be able to touch certain foods). 

Anyway, the court said this has nothing to do with the courts and is up to the Prison Services administration and that is where he should make his request.