I was lost on this one too...I started thinking back to my college biology/anatomy/physiology classes haha

Non-Conventional Essentials
 

Spearfish25 is dead on but may I suggest a couple more track day essentials.

1. Suntan lotion. You will be outside all day.

2. Extra pair of contact lenses. Nothing will ruin your track day faster than tearing or losing a contact lens.

3. Couple packs of Imodium AD, antacids, and some Preparation-H a$$ wipes. Remember that you will be excited/nervous and this in connection with the track cafeteria can play havoc on your intestinal system. Trust me, you will thank me...

Good call. Definitely would have appreciated that during my first track day ever. Also recommended for any difficult tracks you may drive on and if you have a close encounter with a wall. Perhaps a change of clothes is also worthy of the 'must bring' list.

I'd say glasses over contacts even. Then you're sure!

Man... I can't say I've ever had GI problems at the track... That seems so strange. :P

Well don't know about some of your guys' lists but here's mine:

On the Car:
- Oil Cooler
- Spare set of rims with Hoosier's
- Hawk HP+ Pads or better if you have a fast track
- Spare set of pads & rotors if you can
- Exhaust and HFC's, nothing worse than not being able to hear your car under your helmet!
- Dot 4 brake fluid
- Stainless Lines
- Sway Bars (Incredible difference in handling!!)

In your buddies car:
- Jack & 2 Jackstands
- Rhino Ramps
- T Bar or Torque Wrench
- 2 extra quarts of oil
- Extra brake fluid
- FOOD & Water
- Every socket, screwdriver, wrench, and pair of pliers you can find
- Helmet

I read it in a science magazine a few months ago. Apparently water helps release toxins in your body helping you feel more relaxed and also tired. The oils in peanuts provide not only protein but other helpful quick healthy things that help give you energy. Hence why a lot of protein and energy bars have a lot of peanuts in them.

I think you have the water think backwards. Dehydration will make you tired and water will correct that.

Water will not make you tired. A sudden carbohydrate load will release insulin that potentially leads to post-prandial hypoglycemia and fatigue. Your best bet is to drink plenty of fluids throughout the day, not when you're thirsty. Snacking is better than large meals to avoid the carb load and crash effect described above. Power bars tend to have a good mix of carbs, proteins, and fats to give you a more balanced boost than eating a ton of Skittles and hoping for the best.