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
Skipping
Forward Bend
Dand
Jumping Jack
Squat
High Kick
Waist Twisting
Palm-Up Curl
Roman Chair
Knee Drawing
Side Bend
Palm-Down Curl
Tuesday, Thursday, Saturday
Groin Stretch
Side Leg Raise
Jumping Squat
Shoulder circling
Alternate splits
Leg stretch
Leg Raises
Reverse Curl
Sit-up Twist
Leverage Bar Twist
Alternate Leg Raise
Wrist Roller
Power Training
Press Lockout
Press Start
Rise on Toes
Pull
Squat
Shrug
Deadlift
Quarter Squat
Frog Kick
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.
Eg. Monday
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!