Happy update! Was: I need kitten advice!

Updated to add, Lady Liberty, AKA Libby, has found her forever home. She was presented by her new mom to her new brother as "his" kitten. He is over the moon happy. Libby spent the morning snuggling with her new human siblings. I purchased a case of cat food and gave her new mom some money to cover the cost of the first vet visit.

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Thanks to all. Oh, BTW, she not only pooped on the towel in the "shower hotel" last night, but pooped in the crate on the way to her new home today. Such a little thing made such a stink!

As I was driving today, I turned a corner and the car ahead of me was stopped. The door opened, an arm came down, and then they pulled away.

I saw something in the road, and thought it might be a dead opossum. Nope. It was a tiny kitten. It was 91 degrees and someone dropped it on asphalt.

I have a home for it starting tomorrow, but tonight it's safe in my glass-enclosed shower. A couple of questions:

I've put water in a shallow bowl, and it's eaten a bit of cat food twice. Is it okay for me to leave the cat food out for it? It hasn't had a drink that I can tell.

I have a towel in the corner of the shower for it to curl up in. I have made a litter box with a shallow cardboard box and some newspaper. I've given it some cuddles as well.

Is there anything else I'm missing until I deliver it tomorrow? How often to cats urinate/defecate? Drink water? What should I worry about? Will it make itself warm enough in the shower? Our air conditioning is at about 75 in the house.

Thanks, from a dog owner!