4 Days of Confinement and Confusion

Can you tell me what the basic needs that a prison must provide you with? I'm asking because I was recently locked up in solitary confinement (PHI) for 4 days without toilet paper, light, soap, toothpaste, toothbrush, or writing material. I had to eat any food with my hands, and I had never had a hearing of any kind. I was not found guilty of any infraction. Nor was I told why I was being locked up in pre-hearing detention/solitary confinement, until the 4 day when I was released from these conditions .