Officials are pushing back on Marcus Morris' claim he went "51 hours" without something to eat or drink in jail ... telling TMZ Sports there is video proof he was delivered meals and beverages while behind bars.
Morris, 35, made the accusations on his Instagram this week ... after he was released from jail in Broward County. He was arrested over the weekend for allegedly writing $260,000 in bad checks to two Las Vegas casinos in 2024.
