What do I do if a dog is not drinking water because she’s scared and she’s bit me a few times?

The most important thing a dog needs to survive is to stay hydrated so I’m glad that was the title of your post because clearly you understand that.

I’d suggest:

• Serving flavored water. This can be done a couple different ways. Whatever protein dog eats/is allowed, cook a very small amount finely diced or ground (chicken or beef or fish) in water, cool in ‘fridge, serve small amount like 1/4 cup at a time that won’t make a mess if tipped near or possibly in crate. There are removable bowls that mount to the wires inside the crate to help provide access (maybe look around?) Or take a small amount, as in half serving of dog’s food and add a few tablespoons of water. If this dog is eating dry, the kibbles will puff up after a while and become somewhat rehydrated. Along that thought, it may be a good idea to place shallow serving of food there too.
• Instead of forcing a walk with slip lead leash, put a pee pad or multiple pads outside & next to crate so she can feel safe and eliminate on pads without venturing too far from what she considers a safe zone. I realize that may not sound ideal, but with a dog that behavior that you’re describing, it seems likely that she could be a flight risk on a leash, which would be a far worse outcome.
• Be sure to continue making owners aware of what is happening. If the dog is showing signs of dehydration, as time goes on, you may end up having to take dog (probably by carrying crate while inside) to your vehicle to vet for subcutaneous IV injection.