Typically the average water bottle is 16 oz., I believe. So probably about four water bottles; I think you're right. Keep in mind, though: all 64 oz. won't necessarily be taken in from water alone. If you drink juice, water, even soda or coffee, the water in these beverages count as that water intake. Though a cup of coffee isn't as great as a glass of water for your body, you're still absorbing that water. Also, some of that water intake will come from the foods you eat -- mainly fruits and veggies that have a high water content, but that's hard to count...so just try sticking to 64 oz. of beverages. So 64 oz. is just what your body needs to function properly, in other words.
I found this interesting, from the Mayo Clinic website:
* Replacement approach. The average urine output for adults is about 1.5 liters (6.3 cups) a day. You lose close to an additional liter of water a day through breathing, sweating and bowel movements. Food usually accounts for 20 percent of your total fluid intake, so if you consume 2 liters of water or other beverages a day (a little more than 8 cups) along with your normal diet, you will typically replace the lost fluids.
* Eight 8-ounce glasses of water a day. Another approach to water intake is the "8 x 8 rule" — drink eight 8-ounce glasses of water a day (about 1.9 liters). The rule could also be stated, "drink eight 8-ounce glasses of fluid a day," as all fluids count toward the daily total. Though the approach isn't supported by scientific evidence, many people use this basic rule as a guideline for how much water and other fluids to drink.
* Dietary recommendations. The Institute of Medicine advises that men consume roughly 3 liters (about 13 cups) of total beverages a day and women consume 2.2 liters (about 9 cups) of total beverages a day.
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