The cells from the particle accelerator in the TV show "The Flash" don't look like they have a bathroom or a way to pass in food. Is there an explanation in the comic books for this?
They order takeout. How they get the food into the cells without letting the metahuman out isn't shown. A deleted scene was recently released: (spoilers for S1E21, Grodd Lives)
It shows Caitlin wheeling a cart with a ton of takeout food on it. She discusses some of the dietary preferences and restrictions of the imprisoned metahumans:
I now know the dietary habits of all our metahuman inmates. Did you know that the Weather Wizard orders Thai food every day? And that Peekaboo loves enchiladas? And that Death Bolt is vegan?
So this is a regular thing that's been happening off-screen all season.