Hello!
I would start off by saying drink whenever you feel thirsty. It really depends on how big the water bottle is. This is according to the US national public health, engineering, and medicine: About 15.5 cups (3.7 liters) of fluids a day. That's just like a small cup. so like 8, 8 ounce cups a day :) I really hope this helps!
Have a great rest of your day!