Recently I've discovered the whole body cleansing benefits of drinking lemon water (especially in the morning).  I highly recommend this practice as an alternative to caffeinated beverages which only dehydrate you further. Some of lemon waters numerous benefits include liver cleansing, digestive aid, the dissolving of uric acid which causes joint pain as well as cold and flu relief.  Here are a few articles that touch on the key points of lemon waters healthful benefits. 

http://www.waterbenefitshealth.com/benefits-of-drinking-lemon-water.html

http://www.naturalnews.com/034249_lemon_juice_energy.html