I found this idea on pinterest and I LOVE IT. With this size bottle, I have to drink 4 each day, so I would put four rubber bands at the bottom. Each time I finish a bottle, I move a rubber band up to the top. When I have all four at the top, I am good for the day. The number of bands depends on amount of water you need an the size of your water bottle!
Stay cool....Be safe....And STAY HYDRATED!!!