No one has to ask (which, really, people never do) or get up from the table and awkwardly fumble through your kitchen ("Oh, do you have a Brita? Or should I just get tap?"). And in the flurry of cooking dinner for guests, we sometimes forget about water altogether, much less refills.
Get a pretty pitcher, fill it with water, and shove it into the fridge while you're cooking; it'll be cold by the time dinner is served. Then you can add some lemon if you want (or cucumber, as pictured above, if it's appropriate with the food).
It's an extremely simple gesture, but sometimes ample cold water feels like a luxury.
(Image: Roland Glukhov via Shutterstock)