That's enough math for now, but basically drinking somewhere between six and 10 glasses a day (some say it's safe to drink up to a gallon, if you're super thirsty) depending on your exercise level and the temps outdoors. Just don't overdo it, as there are medical issues related to that, namely: water intoxication.
The experts swear by the reusable water bottle strategy
Just like with cheeseburgers, there's a direct correlation between having water in your hand and consuming it. "Carrying water encourages you to drink more merely by the exposure effect," says registered dietitian Monica Auslander. "You invested money into a water bottle, the time to fill it up, and you realize you're saving money -- and recycling issues -- by not opting for plastic."
So if you're swapping out the plastic, what kind of bottle should you get? There's certainly a spectrum of personal preference, but steer toward stainless steel or glass bottles (with rubberized edges to prevent breakage). Just make sure it's BPA and phthalate-free, because plastic bottles can leach toxic chemicals in warm temperatures.