I brutally annihilated this rabbit's sibling accidently

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I brutally annihilated this rabbit's sibling accidently while mowing the lawn at my mothers house, but this one was spared and ran off a little bit and doesn't seem injured. I put it in a box and covered it with some grass and wild herbs and he's sitting in there now. Does this rabbit have a chance of survival or is it doomed since I unearthed them from their nest and shocked the everloving fucking shit out of it? If I can save it, what should I be doing?

Should I pack fresh or dead grass around it as the "nest" material?
Can rabbits have self-heal, dandelion, plantain, and can it have some leaves from my kale plants?
What other food should it be given? Does it need to have it's food pre-broken down or some shit since it's a baby?
Would a styrofoam cup work to give it a water bowl, or would it destroy it via chewing?
How much heat does it need? Does the adequately packed nest take care of that with it's insulation?
What else should I do to try to keep it alive?