If you drink coffee and your taste buds aren't totally dead, good coffee at work is essential. A decent cup can work wonders, while horrid coffee can ruin an otherwise reasonable morning.
A coffee habit can run into real money. At my local Starbucks a cup of regular coffee is $1.50 for 12 ounces, $1.95 for 16 ounces, and $2.25 for 20 ounces. If you buy the smallest size 5 days a week, that's $7.50 a week without tax or tip or over $350 a year. No lattes, no muffins - just a small, plain coffee. Dunkin Donuts, 7-Eleven or the local coffee shop may be a bit cheaper, but you still spend big bucks over time.