I figured out that I pretty much always drink 2 or three bottles of water per day, no matter what size of bottle I use. So a big old water bottle doubles the amount of water I drink in a day
I just borrow the kids' used softdrink PET bottles for a while. No need to wash them out or anything, just rinse out the few leftover drops of Coke or 7-Up first time you fill it up, and switch to a fresh one after a while, let them recycle the old one.
I figured out that I pretty much always drink 2 or three bottles of water per day, no matter what size of bottle I use. So a big old water bottle doubles the amount of water I drink in a day