Important Parts of a Drip Coffee Machine Drip coffee makers work well for those who want to make an instant cup of coffee. They function by heating filtered cold water in the reservoir and then pouring it over coarsely ground beans. Some drip coffee makers have an integrated bean grinder. https://wwwcoffeeeuk83428.total-blog.com/15-weird-hobbies-that-ll-make-you-more-effective-at-drip-coffee-55689943