The recommended amount of water to drink per day can vary depending on various factors such as age, sex, activity level, and overall health. However, a commonly cited guideline is to drink eight 8-ounce glasses of water per day, which equals about 2 liters or half a gallon. This is known as the "8x8 rule." It's worth noting that individual water needs can vary greatly, and it's important to listen to your body's signals for thirst and stay adequately hydrated throughout the day. Consulting with a healthcare professional can provide personalized recommendations based on your specific needs.