I train at home so most of my stuff is in my training room with my buddies which never shut-up when I am training (I have two of these):
I bring the nylon adjustable shoulder strap from my lap top bag, and use it to do Weighted Pull-ups and Weighted Elevated Push-ups.
My workout progression log: Which also contains, previous workouts, dietary parameters, work out calender, etc
Also bought another weight stacker a few months ago: (now I have two, I got tired of the plates laying around the Squat rack/Bench set, lol)
Before work out, I usually drink a several cups of coffee, a Protein/carb drink, and several glasses of water. And before commencement, I bring about 4 large glasses of water. I take no supplements other than Whey/Casien Powder, Fish oil, flax oil, and fiber-powder.
And, the most important thing, is I bring my sons Quentin (22, and 235 pounds, and Dustin (26, and 240ish pounds) with me to the gym on a regular basis, to work out with the old man.
Nothing special. Pretty basic and simple, and served extremely well.