It works! Could be improved though.
Works really well! Took off one star though because I really wish for two things: shorter intervals (30 mins is too long!) and longer sips. If I take even the shortest sip of water this little thing shuts down for 30 mins and doesn't care that I barely even drank anything. To be effective, it needs to care about how long I tilt the bottle to take a "real" drink.
Rating: 4 stars