It is really getting on my nerves that everyone seems to think that they are allowed to just grab whatever I'm drinking out of whenever they're thirsty. Just because my cup is always full doesn't mean they're allowed to drink from it!
Even worse, I've been having a difficult time making sure I'm drinking enough water. I pick certain cups because I know if I drink X number of them, it'll give me the 64oz minimum I'm shooting for. Then someone goes and grabs my cup and I have no clue how much I drank out of it so now I've lost track of how much I've actually had to drink for the day.