I'm using the supplied Google rapid charger at home for overnight and a older Samsung quick charger at work for top offs. Seems great for now but I might switch the 2 and use the rapid charger at work.
You can order the charger from Google directly, but not really cheap. For overnight charging you can use almost any charging brick with a USB A to C cable. You don't need Quick-charge. I like Anker and Aukey for bricks and cables.