Meanwhile, just because I can't find a study, doesn't mean you shouldn't drink more water. In fact, drink as much as you can. Here's the reason: If you drink tons of water, you won't be drinking other things (like sodas) that are full of sugar. This alone will increase your health.
Some people claim that drinking lots of water helps "detox" your body by washing away all the chemicals that build up. Again, I haven't been able to find solid studies to back this, but it could be true. You may also hear about "alkaline" water which is supposed to improve your health by counteracting all the extra acids in processed foods. Seems possible, but I haven't run across any solid studies for this either.
Be sure to drink good quality water. Some cities have excellent drinking water (better than bottled water that you can purchase in a store) and other cities have poor water quality. Invest in a good water filter for your home and you should be OK.
Next Anti-Aging Food: Berries