If it's leaking that much, it should be pretty obvious. They can leak from the pump seals, either end of the two hoses that run down to and back up from the steering rack or the rack itself. Put a piece of cardboard under the car at night and you should see drops of red fluid under the point of the leak. If none, have someone move the steering wheel stop to stop with the engine running while you look under the car. You should see a dripping somewhere. Examine the area behind the pulley on the PS pump with a good light but be careful as you don't want some part of your anatony to get caught in the belt.

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