Seeing as how 8 glasses of water a day is the minimum recommended consumption (my physician has recommended 2x for me!), would it be possible to change the icon to go over to a second glass for 9-16? Being the neat freak that I am, the overflowing glass has a bit of a negative connotation for me

Sounds like a good idea to me! Until this change is made, perhaps click for 1 glass when you've finished 2 glasses? And just know each time that 1=2 for you :)