PROTIP:

[mcity]

If you are drinking out of a sealable bottle, like, say, a Gatorade bottle water in, and the food you are eating is greasy and or saucy, such as pork chops in black bean sauce, for instance, then for the love of taste make sure your lips are clean before you drink.

Unless you happen to be at the end of the bottle, in which case you should wash it before you refill.