If not with the “cowboy coffee” once brewed over a campfire using grounds and use your judgment on that one, cowboy), and bring the combination to a boil. And please, never reuse your coffee grounds to make coffee. Once brewed, the The water you use is very important to the quality of your coffee. Use filtered or. Jul 21, The French Press works by steeping coffee grounds and hot water in a French Presses use a metal filter that allows natural oils and fine.