1. What kind of toothpaste do you use?
Arm & Hammer Baking soda & peroxide whitening, or Tom's of Maine baking soda.  I like to feel like my tooth-cleaning products are really doing something, so I gravitate towards astringent-tasting stuff like baking soda and off-brand listerine.  
2. Do you take vitamins?
I should, but I don't often remember.  I'd probably do better if I kept them at work, and took them with my midmorning tea, or my lunch.  I am usually  conscious at work.  I am not often conscious in the morning before I leave for work - witness the fact that I have only once managed to remember to bring last night's restaurant leftovers in for lunch.  
3. Which over-the-counter drug can't you live without?
Hm.  I would most hate to be without regular-strength tylenol, because it's the most widely useful and side-effect-less item in my personal pharmacopoeia.  But I would really, really miss my little cabinet of ibuprofen, sudafed, benedryl, tums, pepto-bismol, and lubricant eye drops.  
4. What kind of soap do you have in your shower?
What kind of soap don't I have in my shower might be more quickly answered.  Leaving aside items specifically for hair and face, I have a bar of Dial soap, a bottle of lavender-vanilla shower gel, a bottle of white tea shower gel, and a bottle of citrusy exfoliating body scrub.  
5. What is the most unusual item in your medicine cabinet?
Hydrogen peroxide.  And an empty box that a lipstick came in.