YOU KNOW THOSE REUSABLE WATER BOTTLES you drink from throughout the day? (You *are* drinking water throughout the day, right?) Here's why – and how – you want to wash them every night: Each time you drink from them, bacteria go into the bottle. (Eww) And they breed if you don't wash the bottle. (double Eww – triple Eww in flu season) SIMPLE SOLUTION: When you get home…