Food Tips: Flavored Water

I like to drink water, but I tend to drink it more at work than at home with the convenience of the chilled water cooler. Lately, I've started to make my own flavored water. During pregnancy, and now breastfeeding, I need to keep my liquids up but don't need all the calories, sugar, high fructose corn syrup, and added flavors and colors in juices and sports drinks that I'd typically drink (not counting carbonated beverages or artificially sweetened things I rarely drink). Bonus points for now using my fridge water filter, reducing the cost to me of buying at the store, and the environmental impact of bottles, manufacturing, transportation, and recycling.

A few of the varieties of water I've tried: lemon, lime, raspberries, mint (from the herb garden) and some combinations of the above. I hear cucumbers are refreshing too.