Bruce liked Chinese food and used to have a lot of variety in his food. I don't know much about the specifics of his diet.
His fitness recommendation from the Tao of Jeet Kune Do is as follows:
Monday, Wednesday, Friday
Tuesday, Thursday, Saturday
Side Leg Raise
Leverage Bar Twist
Alternate Leg Raise
Rise on Toes
He used to warm up a particular part before intense exercise on that part and stretch it later. He used to exercise twice a day, more on which is written in the book.
I don't think he did all exercises mentioned above in a day. He used to vary them according to his mood. I have no idea about the power workout. He also believed that Indian wrestler workout of dand and baithak is quite complete as influenced by an Indian wrestler.
I personally do 2+2 of the above workouts 3 sets a day.
Skips (3x3 min)
Forward bend (Stretching :once)
Waist Twisting (Stretch)
Palm Up Curl (3 sets)
P.S. I highly recommend "The Tao of JKD". It's a beautiful book!