Wild toddler bunny found

So I found I baby or toddler bunny it's about 6 inches long and is brown. It's eyes are open and it can move. I want to keep it. How do I keep it alive. I do not want to release it because it's raining and there are cats around. But the bunny isn't moving but it's alive. How to I keep it alive.

Give it food (carrots, leaves, hay, veggies) and water.

If it's wounded, call a veterinarian.